WKN Weer, Klimaat en Natuurrampen
Lees alles over het onstuimige weer op onze planeet, volg orkanen en tornado's, zie hoe vulkanen uitbarsten en hoe Moeder Aarde beeft bij een aardbeving. Alles over de verwoestende kracht van onze planeet en tal van andere natuurverschijnselen.
Op woensdag 29 december 2004 23:31 schreef thijsk87 het volgende:
Weet je waar me dat aan doet denken:
GOODNIGHT SAIGON-Billy Joel
"Goodnight Saigon"
by Billy Joel
We met as soul mates
On Paris Island.
We left as inmates
From an asylum.
And we were sharp
As sharp as knives.
And we were so gung-ho
To lay down our lives.
We came in spastic
Like tameless horses.
We left in plastic
As numbered corpses.
And we learned fast
To travel light.
Our arms were heavy
But our bellies were tight.
We had no cameras
To shoot the landscape.
We passed the hash pipe
And played our Doors' tapes.
And it was dark
So dark at night.
And we held on to each other
Like brother to brother.
We promised our mothers' we'd write.
Remember Charlie?
Remember Baker?
They left their childhood
On every acre
And who was wrong?
And who was right?
It didn't matter in the
Thick of the fight.
We held the day
In the palm
Of our hand.
They ruled the night
And the night
Seemed to last
As long as six weeks
On Paris Island
We held the coastline
They held the highlands
And they were sharp
As sharp as knives.
They heard the hum
Of the motors.
The counted the rotors
And waited
For us to arrive.
And we would go down together.
We said we'd all go down together.
Yes we would all go down together.
En dan vooral dat laatste stuk
Weet je waar me dat aan doet denken:
GOODNIGHT SAIGON-Billy Joel
"Goodnight Saigon"
by Billy Joel
We met as soul mates
On Paris Island.
We left as inmates
From an asylum.
And we were sharp
As sharp as knives.
And we were so gung-ho
To lay down our lives.
We came in spastic
Like tameless horses.
We left in plastic
As numbered corpses.
And we learned fast
To travel light.
Our arms were heavy
But our bellies were tight.
We had no cameras
To shoot the landscape.
We passed the hash pipe
And played our Doors' tapes.
And it was dark
So dark at night.
And we held on to each other
Like brother to brother.
We promised our mothers' we'd write.
Remember Charlie?
Remember Baker?
They left their childhood
On every acre
And who was wrong?
And who was right?
It didn't matter in the
Thick of the fight.
We held the day
In the palm
Of our hand.
They ruled the night
And the night
Seemed to last
As long as six weeks
On Paris Island
We held the coastline
They held the highlands
And they were sharp
As sharp as knives.
They heard the hum
Of the motors.
The counted the rotors
And waited
For us to arrive.
And we would go down together.
We said we'd all go down together.
Yes we would all go down together.
En dan vooral dat laatste stuk
Wetenschappers zijn zich juist beginnen bedenken dat als er water was op Mars er dan mss ook wel bacteriën waren op Mars. Het probleem is dat de brokstukken die ze naar de aarde halen dus in quarantaine vervoerd moeten worden omdat ze bang zijn voor rare ziektes.quote:Op zondag 26 december 2004 21:35 schreef Speth het volgende:
[..]
klopt, en die mogelijkheid ontken ik ook niet, maar:
Er is in de eerste plaats een leefbare planeet voor nodig die explodeert. Waarom houden sommigen er dan deze moeilijke theorie op na, terwijl het veel waarschijnlijker is dat het proces dat de eerste levensvorm(en) deed ontstaan gewoon op aarde plaatsvond? Of dat nou op onze of op een andere, geexplodeerde planeet gebeurt is even waarschijnlijk. Dat een brokstuk van zo'n planeet echter op Aarde landt met bacterien en al (die de inslag ook nog eens intact moeten overleven) maakt die theorie veel onwaarschijnlijker.
Een komeet bestaat uit ijs, dus daarin kunnen ook bacteriën overleven. En aangezien de aarde al ontelbare keren in zn bestaan geraakt is door vanalles en nog wa, is het toch niet zo onlogisch dat het leven onstaan is door bacteriën uit een restje komeet?
Tis trouwens al een ganse week over het heelal en alles erin in documentaires op National Geographic. Meestal rond 19u, herhaling om 0.00u
Sex is not the answer. Sex is the question. 'Yes' is the answer.
Nu ook op foto verkrijgbaar
Nu ook op foto verkrijgbaar
Asteroid flyby a once in a lifetime event
An asteroid expected to fly past Earth in 2029 will be visible to the naked eye, scientists projected Thursday. It's a once-in-a-millennium event. And you may want to buy plane tickets now, as the flyby will be visible only from Europe, Africa and western Asia.
There has been no event like this in modern history. Some people have seen dramatic fireballs created by small space rocks blazing through Earth's atmosphere. And two house-sized asteroids have made closer passes. But they were not visible without telescopes.
The 2029 event will be the closest brush by a good-sized asteroid known to occur. The rock will pass Earth inside the orbits of some satellites. No other asteroid has ever been clearly visible to the unaided eye. The asteroid is roughly estimated to be a little more than 1,000 feet (320 meters) wide.
MN4
The rock, catalogued as 2004 MN4, was discovered last June. It was seen again in December, and for a time scientists said it had the highest odds of hitting Earth ever given to a space rock. Subsequent observations refined the future path and eliminated those odds for the 2029 flyby. It won't hit the Moon, either.
This week, NASA scientists used new observations from the Arecibo Observatory to further pin down the track of 2004 MN4.
On April 13, 2029, it will be about 22,600 miles (36,350 kilometers) from Earth's center. That is just below the altitude of geosynchronous satellites, which hover in fixed perches above the planet to communicate with and collect data on half the globe at all times.
Of the ten known closest asteroid flybys, 2004 MN4 is by far the largest object, said Steve Chesley of NASA's Jet Propulsion Laboratory. Only two have come closer, and they were only tens of yards (meters) wide.
"All of the others in the top ten were discovered during the close approach, whereas for 2004 MN4 the close approach is predicted well in advance," Chesley said in a telephone interview.
Last fall, an even larger asteroid made a notable flyby. That rock, called Toutatis, is about 2.9 miles long and 1.5 miles wide (4.6 by 2.4 kilometers). Its closest approach, widely photographed, was about four times the distance to the Moon. It was not visible to the naked eye.
What to expect
The asteroid 2004 MN4 is expected to shine like a fast-moving star at magnitude 3.3, Chesley said. That would be easily visible under dark skies without the help of binoculars or telescopes.
On this astronomers' magnitude scale, smaller numbers represent brighter objects. The brightest stars and planets have negative magnitudes. The dimmest stars visible under perfect sky conditions away from city lights are about magnitude 6.5. Urban residents may need to get out of town to see the rare event.
Chesley said the exact proximity of the object could cause its brightness to vary, but probably only by a few tenths of a magnitude.
The asteroid will pass through the constellation of Cancer. Observers with clear skies in Europe, Africa and parts of Asia will be able to see a star-like point of light.
"Whether you could see it from the center of London is another matter," said Alan Harris of the Space Science Institute.
Asteroid Vesta
Harris notes that asteroid Vesta -- 334 miles (538 kilometers) in diameter -- periodically gets as bright as magnitude 5.3, which is visible to the naked eye under very dark sky conditions. "Curiously, Vesta attains this brightness at its opposition in July, 2029, only a few months after the April 2029 apparition of MN4," Harris told SPACE.com.
With small telescopes and high-tech tracking software, the asteroid's shape could be evident.
"It will be potentially resolvable with small telescopes, but they'll have to be able to track pretty fast," Chesley said.
The rock will cover about 42 degrees of sky per hour, slower than a satellite but noticeably quick in the small field of view of a telescope.
Rare event
On average, one would expect a similarly close Earth approach by an asteroid of this size only every 1,300 years or so, Chesley and his colleagues have determined.
2004 MN4 circles the Sun, but unlike most asteroids that reside in a belt between Mars and Jupiter, the 323-day orbit of 2004 MN4 lies mostly within the orbit of Earth.
The 2029 flyby will bend the rock's path and change the circumstances of later close passes to Earth. "However, our current risk analysis for 2004 MN4 indicates that no subsequent Earth encounters in the 21st Century are of concern," according to a statement issued by Chesley and his JPL colleagues Paul Chodas, Jon Giorgini and Don Yeomans.
Additional observations in coming months and years could help eliminate the small chances of impacts in years after 2029. Were an asteroid the size of 2004 MN4 to hit Earth, it would cause local devastation and regional damage. It would not be expected to cause any sort of global disruption, experts say.
An asteroid expected to fly past Earth in 2029 will be visible to the naked eye, scientists projected Thursday. It's a once-in-a-millennium event. And you may want to buy plane tickets now, as the flyby will be visible only from Europe, Africa and western Asia.
There has been no event like this in modern history. Some people have seen dramatic fireballs created by small space rocks blazing through Earth's atmosphere. And two house-sized asteroids have made closer passes. But they were not visible without telescopes.
The 2029 event will be the closest brush by a good-sized asteroid known to occur. The rock will pass Earth inside the orbits of some satellites. No other asteroid has ever been clearly visible to the unaided eye. The asteroid is roughly estimated to be a little more than 1,000 feet (320 meters) wide.
MN4
The rock, catalogued as 2004 MN4, was discovered last June. It was seen again in December, and for a time scientists said it had the highest odds of hitting Earth ever given to a space rock. Subsequent observations refined the future path and eliminated those odds for the 2029 flyby. It won't hit the Moon, either.
This week, NASA scientists used new observations from the Arecibo Observatory to further pin down the track of 2004 MN4.
On April 13, 2029, it will be about 22,600 miles (36,350 kilometers) from Earth's center. That is just below the altitude of geosynchronous satellites, which hover in fixed perches above the planet to communicate with and collect data on half the globe at all times.
Of the ten known closest asteroid flybys, 2004 MN4 is by far the largest object, said Steve Chesley of NASA's Jet Propulsion Laboratory. Only two have come closer, and they were only tens of yards (meters) wide.
"All of the others in the top ten were discovered during the close approach, whereas for 2004 MN4 the close approach is predicted well in advance," Chesley said in a telephone interview.
Last fall, an even larger asteroid made a notable flyby. That rock, called Toutatis, is about 2.9 miles long and 1.5 miles wide (4.6 by 2.4 kilometers). Its closest approach, widely photographed, was about four times the distance to the Moon. It was not visible to the naked eye.
What to expect
The asteroid 2004 MN4 is expected to shine like a fast-moving star at magnitude 3.3, Chesley said. That would be easily visible under dark skies without the help of binoculars or telescopes.
On this astronomers' magnitude scale, smaller numbers represent brighter objects. The brightest stars and planets have negative magnitudes. The dimmest stars visible under perfect sky conditions away from city lights are about magnitude 6.5. Urban residents may need to get out of town to see the rare event.
Chesley said the exact proximity of the object could cause its brightness to vary, but probably only by a few tenths of a magnitude.
The asteroid will pass through the constellation of Cancer. Observers with clear skies in Europe, Africa and parts of Asia will be able to see a star-like point of light.
"Whether you could see it from the center of London is another matter," said Alan Harris of the Space Science Institute.
Asteroid Vesta
Harris notes that asteroid Vesta -- 334 miles (538 kilometers) in diameter -- periodically gets as bright as magnitude 5.3, which is visible to the naked eye under very dark sky conditions. "Curiously, Vesta attains this brightness at its opposition in July, 2029, only a few months after the April 2029 apparition of MN4," Harris told SPACE.com.
With small telescopes and high-tech tracking software, the asteroid's shape could be evident.
"It will be potentially resolvable with small telescopes, but they'll have to be able to track pretty fast," Chesley said.
The rock will cover about 42 degrees of sky per hour, slower than a satellite but noticeably quick in the small field of view of a telescope.
Rare event
On average, one would expect a similarly close Earth approach by an asteroid of this size only every 1,300 years or so, Chesley and his colleagues have determined.
2004 MN4 circles the Sun, but unlike most asteroids that reside in a belt between Mars and Jupiter, the 323-day orbit of 2004 MN4 lies mostly within the orbit of Earth.
The 2029 flyby will bend the rock's path and change the circumstances of later close passes to Earth. "However, our current risk analysis for 2004 MN4 indicates that no subsequent Earth encounters in the 21st Century are of concern," according to a statement issued by Chesley and his JPL colleagues Paul Chodas, Jon Giorgini and Don Yeomans.
Additional observations in coming months and years could help eliminate the small chances of impacts in years after 2029. Were an asteroid the size of 2004 MN4 to hit Earth, it would cause local devastation and regional damage. It would not be expected to cause any sort of global disruption, experts say.
36,350 KM... is nog "net" geen rondje om de Aarde.quote:Op dinsdag 8 februari 2005 12:56 schreef Frutsel het volgende:
Asteroid flyby a once in a lifetime event
-KNIP-
On April 13, 2029, it will be about 22,600 miles (36,350 kilometers) from Earth's center. That is just below the altitude of geosynchronous satellites, which hover in fixed perches above the planet to communicate with and collect data on half the globe at all times.
-KNIP-
Misschien kan je tegen die tijd wel met een toeristen shuttle langs vliegen.
FF snel een reisje boeken...
<a href="http://www.vwkweb.nl/" rel="nofollow" target="_blank">Vereniging voor weerkunde en klimatologie</a>
<a href="http://www.estofex.org/" rel="nofollow" target="_blank">ESTOFEX</a>
<a href="http://www.estofex.org/" rel="nofollow" target="_blank">ESTOFEX</a>
*zet 2029, April 13 gelijk in me agenda en gaat vast sparen... *
nog 24 jaar om de Staatsloterij en/of Postcodeloterij te winnen
nog 24 jaar om de Staatsloterij en/of Postcodeloterij te winnen
LONDEN - Britse wetenschappers maken zich zorgen over een enorme asteroïde die in 2029 rakelings langs de aarde zal scheren. Zij vrezen dat de zwaartekracht van onze planeet de baan van het object dusdanig kan veranderen, dat het later alsnog in botsing komt met de aarde. Dat berichtte het dagblad The Times maandag.
De asteroïde, met de naam 2004 MN4, passeert de aarde in 2029 op een afstand tussen de 15.000 en 25.000 miles. Dat is ongeveer eentiende van de afstand tussen de aarde en de maan. Voor astronomische begrippen is dat een bijna-botsing. Het object kan met het blote oog worden waargenomen.
Hoewel astronomen er zeker van zijn dat de asteroïde ons in eerste instantie zal missen, vrezen zij het effect dat de aantrekkingskracht van de aarde zal hebben. In het ergste geval keert de asteroïde tussen 2034 en 2036 terug en raakt hij de aarde dan wel.
De asteroïde, met de naam 2004 MN4, passeert de aarde in 2029 op een afstand tussen de 15.000 en 25.000 miles. Dat is ongeveer eentiende van de afstand tussen de aarde en de maan. Voor astronomische begrippen is dat een bijna-botsing. Het object kan met het blote oog worden waargenomen.
Hoewel astronomen er zeker van zijn dat de asteroïde ons in eerste instantie zal missen, vrezen zij het effect dat de aantrekkingskracht van de aarde zal hebben. In het ergste geval keert de asteroïde tussen 2034 en 2036 terug en raakt hij de aarde dan wel.
Als je ziet dat het aantal ontdekte asteroiden in de laatste vijf jaar is verzesvoudigd... lijkt het me niet onwaarschijnlijk dat het binnenkort eens gebeurd...
Toch grappig.. een jaar geleden hebben ze het over 13 April 2029... en nu over 13 April 2036...
Killer Asteroids Arent just In Movies
CAPE CANAVERAL, Fla. // Mark your calendar for Sunday, April 13, 2036. That's when a 1,000-foot-wide asteroid named Apophis might hit Earth with enough force to obliterate a small state.
The odds of a collision are 1 in 6,250. But while that's a long shot at the racetrack, the stakes are too high for astronomers to ignore.
For now, Apophis represents the most imminent threat from the worst type of natural disaster known, one reason NASA is spending millions to detect the threat from this and other asteroids.
A direct hit on an urban area could unleash more destruction than Hurricane Katrina, the 2004 Asian tsunami and the 1906 San Francisco earthquake combined. The blast would equal 880 million tons of TNT or 65,000 times the power of the atomic bomb dropped on Hiroshima.
Objects this size are thought to hit Earth about once every 1,000 years, and, according to recent estimates, the risk of dying from a renegade space rock is comparable to the hazards posed by tornadoes and snakebites. Those kinds of statistics have moved the once-far-fetched topic of killer asteroids from Hollywood movie sets to the halls of Congress.
"Certainly we had a major credibility problem at the beginning - a giggle factor," said David Morrison, an astro-biologist at NASA's Ames Research Center in Mountain View, Calif. "Now, many people are aware this is something we can actually deal with, mitigate and defend against."
In 1998, lawmakers formally directed NASA to identify by 2008 at least 90 percent of the asteroids more than a kilometer (0.6 mile) wide that orbit the sun and periodically cross Earth's path. That search is now more than three-quarters complete.
Last year, Congress directed the space agency to come up with options for deflecting potential threats. Ideas seriously discussed include lasers on the moon, futuristic "gravity tractors," spacecraft that ram incoming objects and Hollywood's old standby, nuclear weapons.
To help explore possible alternatives, former Apollo astronaut Rusty Schweickart has formed the B612 Foundation. The organization's goal is to be able to significantly alter the orbit of an asteroid in a controlled way by 2015.
"You can watch all of the golf on television you want, but if you want to go out and break par, it's going to take a lot of playing," Schweickart said. "And you're going to learn a lot that you thought you knew, but you didn't."
Throughout their 4.5 billion-year history, Earth and its neighbors have been bombarded.
A glance at our moon shows the scars left by countless collisions with asteroids and comets. Some scientists believe the moon was created when part of early Earth was ripped away in a cosmic impact with an object the size of Mars.
Earth also has scars, but most have been hidden by vegetation or eroded by geologic processes such as rain and wind. About 170 major impact sites, including the 4,000-foot-wide Barringer Crater in northern Arizona, have been identified around the globe.
Within the past century, an extraterrestrial chunk of rock about 200 feet wide is thought to have caused a 1908 blast near Tunguska, Siberia, that leveled 60 million trees in an area the size of Rhode Island. Researchers theorize the object exploded 4 to 6 miles above the ground with the force of 10 million to 15 million tons of TNT.
Few outside scientific circles took the threat posed by near-Earth objects seriously until 1980. Then, Luis and Walter Alvarez published a study based on geologic evidence that concluded that a cataclysmic asteroid or comet impact 65 million years ago caused the mass extinction of two-thirds of all life on Earth, including the dinosaurs.
Dubbed the Great Exterminator, the colossal object was estimated at 7 miles in diameter and created a blast hundreds of millions of times more destructive than a nuclear weapon. Objects that size are thought to hit Earth about every 100 million years.
NASA scientists studying satellite photos bolstered the Alvarezes' theory with the discovery in 1991 of an impact crater 125 miles wide buried beneath the northwestern corner of Mexico's Yucatan Peninsula. Three years later, NASA photos of another sort drove home the potential for cosmic crashes within the solar system.
Spectacular images from the Hubble Space Telescope of Comet Shoemaker-Levy's collision with Jupiter showed 21 comet fragments, some more than a mile wide, producing colossal fireballs that rose above the giant planet's cloud deck.
"I think the most important development for getting this [public awareness] going was the Alvarezes' research that the dinosaurs went extinct as the result of an impact," Morrison said. "We were faced with a real example where an impact had done terrible damage."
In 1998, a year when the asteroid-disaster movie Armageddon was the top-grossing film worldwide, Congress held hearings that led to the creation of a Near Earth Object Program office at NASA's Jet Propulsion Laboratory in Pasadena, Calif.
That year marked the beginning of the Spaceguard Survey aimed at discovering 90 percent of near-Earth asteroids more than a kilometer wide.
Today, astronomers at five primary U.S. sites work on the survey, which NASA funds with about $4 million annually. Scientists estimate there are 1,100 near-Earth asteroids that are larger than a kilometer wide. With two years to go, they have found 834, or about 76 percent, of the estimated total.
Congress directed NASA in December to look at expanding the search to asteroids larger than 140 meters (460 feet) in diameter and completing the new survey by 2020. Objects that size are capable of destroying a city.
The more often an asteroid or comet is sighted, the more precisely its orbit can be calculated. Researchers hope that radar observations of Apophis taken last weekend by the Arecibo telescope in Puerto Rico could show the odds of a collision more remote.
Killer Asteroids Arent just In Movies
CAPE CANAVERAL, Fla. // Mark your calendar for Sunday, April 13, 2036. That's when a 1,000-foot-wide asteroid named Apophis might hit Earth with enough force to obliterate a small state.
The odds of a collision are 1 in 6,250. But while that's a long shot at the racetrack, the stakes are too high for astronomers to ignore.
For now, Apophis represents the most imminent threat from the worst type of natural disaster known, one reason NASA is spending millions to detect the threat from this and other asteroids.
A direct hit on an urban area could unleash more destruction than Hurricane Katrina, the 2004 Asian tsunami and the 1906 San Francisco earthquake combined. The blast would equal 880 million tons of TNT or 65,000 times the power of the atomic bomb dropped on Hiroshima.
Objects this size are thought to hit Earth about once every 1,000 years, and, according to recent estimates, the risk of dying from a renegade space rock is comparable to the hazards posed by tornadoes and snakebites. Those kinds of statistics have moved the once-far-fetched topic of killer asteroids from Hollywood movie sets to the halls of Congress.
"Certainly we had a major credibility problem at the beginning - a giggle factor," said David Morrison, an astro-biologist at NASA's Ames Research Center in Mountain View, Calif. "Now, many people are aware this is something we can actually deal with, mitigate and defend against."
In 1998, lawmakers formally directed NASA to identify by 2008 at least 90 percent of the asteroids more than a kilometer (0.6 mile) wide that orbit the sun and periodically cross Earth's path. That search is now more than three-quarters complete.
Last year, Congress directed the space agency to come up with options for deflecting potential threats. Ideas seriously discussed include lasers on the moon, futuristic "gravity tractors," spacecraft that ram incoming objects and Hollywood's old standby, nuclear weapons.
To help explore possible alternatives, former Apollo astronaut Rusty Schweickart has formed the B612 Foundation. The organization's goal is to be able to significantly alter the orbit of an asteroid in a controlled way by 2015.
"You can watch all of the golf on television you want, but if you want to go out and break par, it's going to take a lot of playing," Schweickart said. "And you're going to learn a lot that you thought you knew, but you didn't."
Throughout their 4.5 billion-year history, Earth and its neighbors have been bombarded.
A glance at our moon shows the scars left by countless collisions with asteroids and comets. Some scientists believe the moon was created when part of early Earth was ripped away in a cosmic impact with an object the size of Mars.
Earth also has scars, but most have been hidden by vegetation or eroded by geologic processes such as rain and wind. About 170 major impact sites, including the 4,000-foot-wide Barringer Crater in northern Arizona, have been identified around the globe.
Within the past century, an extraterrestrial chunk of rock about 200 feet wide is thought to have caused a 1908 blast near Tunguska, Siberia, that leveled 60 million trees in an area the size of Rhode Island. Researchers theorize the object exploded 4 to 6 miles above the ground with the force of 10 million to 15 million tons of TNT.
Few outside scientific circles took the threat posed by near-Earth objects seriously until 1980. Then, Luis and Walter Alvarez published a study based on geologic evidence that concluded that a cataclysmic asteroid or comet impact 65 million years ago caused the mass extinction of two-thirds of all life on Earth, including the dinosaurs.
Dubbed the Great Exterminator, the colossal object was estimated at 7 miles in diameter and created a blast hundreds of millions of times more destructive than a nuclear weapon. Objects that size are thought to hit Earth about every 100 million years.
NASA scientists studying satellite photos bolstered the Alvarezes' theory with the discovery in 1991 of an impact crater 125 miles wide buried beneath the northwestern corner of Mexico's Yucatan Peninsula. Three years later, NASA photos of another sort drove home the potential for cosmic crashes within the solar system.
Spectacular images from the Hubble Space Telescope of Comet Shoemaker-Levy's collision with Jupiter showed 21 comet fragments, some more than a mile wide, producing colossal fireballs that rose above the giant planet's cloud deck.
"I think the most important development for getting this [public awareness] going was the Alvarezes' research that the dinosaurs went extinct as the result of an impact," Morrison said. "We were faced with a real example where an impact had done terrible damage."
In 1998, a year when the asteroid-disaster movie Armageddon was the top-grossing film worldwide, Congress held hearings that led to the creation of a Near Earth Object Program office at NASA's Jet Propulsion Laboratory in Pasadena, Calif.
That year marked the beginning of the Spaceguard Survey aimed at discovering 90 percent of near-Earth asteroids more than a kilometer wide.
Today, astronomers at five primary U.S. sites work on the survey, which NASA funds with about $4 million annually. Scientists estimate there are 1,100 near-Earth asteroids that are larger than a kilometer wide. With two years to go, they have found 834, or about 76 percent, of the estimated total.
Congress directed NASA in December to look at expanding the search to asteroids larger than 140 meters (460 feet) in diameter and completing the new survey by 2020. Objects that size are capable of destroying a city.
The more often an asteroid or comet is sighted, the more precisely its orbit can be calculated. Researchers hope that radar observations of Apophis taken last weekend by the Arecibo telescope in Puerto Rico could show the odds of a collision more remote.
SeLang
Black swans matter
LONDEN - Een asteroïde met een geschatte doorsnee van tussen de 400 en ruim 900 meter scheert maandag rakelings langs de aarde. Het object vliegt langs op een afstand van slechts 400.000 kilometer, een bijna-botsing in ruimtevaart begrippen, meldde de Britse krant The Times woensdag.
Astronomen ontdekten de asteroïde in 2004 en gaven hem de naam 2004 XP14. Vanaf de Amerikaanse westkust moet het passeren met telescopen te zien zijn.
Maan
Met de maan, die op een afstand van ongeveer 380.000 kilometer van de aarde ligt, zal de asteroïde niet botsen, aldus Tim van Kempen van de Nederlandse Onderzoekschool voor Astronomie (NOVA). "Daarvoor is het een te kleine asteroïde en bovendien vliegt hij in een baan verder dan de maan."
In Nederland is het ruimteverschijnsel niet zien. De asteroïde is om 6.30 uur het dichtst bij de aarde, maar valt dan niet op door het vele licht van de ochtendzon, de lantaarnpalen in Nederland en het zwakke licht van de asteroïde zelf, aldus Van Kempen. "Bovendien vliegt zij heel snel." Binnen een halve dag is het spektakel voorbij.
Klimaat
Wanneer een dergelijke asteroïde de aarde raakt, zou dat voornamelijk gevolgen hebben voor het klimaat en milieu, laat een woordvoerder van Space Expo Noordwijk aan NU.nl weten.
De volgende asteroïde wordt volgens de woordvoerder op 13 april 2029 verwacht. Deze zal langs Azie en Noord-Afrika vliegen, op een afstand van 32.000 kilometer, waardoor hij zelfs met het blote oog waarneembaar zal zijn.
http://neo.jpl.nasa.gov/cgi-bin/db_shm?sstr=2004%20XP14
[ Bericht 4% gewijzigd door Frutsel op 28-06-2006 22:00:40 ]
Astronomen ontdekten de asteroïde in 2004 en gaven hem de naam 2004 XP14. Vanaf de Amerikaanse westkust moet het passeren met telescopen te zien zijn.
Maan
Met de maan, die op een afstand van ongeveer 380.000 kilometer van de aarde ligt, zal de asteroïde niet botsen, aldus Tim van Kempen van de Nederlandse Onderzoekschool voor Astronomie (NOVA). "Daarvoor is het een te kleine asteroïde en bovendien vliegt hij in een baan verder dan de maan."
In Nederland is het ruimteverschijnsel niet zien. De asteroïde is om 6.30 uur het dichtst bij de aarde, maar valt dan niet op door het vele licht van de ochtendzon, de lantaarnpalen in Nederland en het zwakke licht van de asteroïde zelf, aldus Van Kempen. "Bovendien vliegt zij heel snel." Binnen een halve dag is het spektakel voorbij.
Klimaat
Wanneer een dergelijke asteroïde de aarde raakt, zou dat voornamelijk gevolgen hebben voor het klimaat en milieu, laat een woordvoerder van Space Expo Noordwijk aan NU.nl weten.
De volgende asteroïde wordt volgens de woordvoerder op 13 april 2029 verwacht. Deze zal langs Azie en Noord-Afrika vliegen, op een afstand van 32.000 kilometer, waardoor hij zelfs met het blote oog waarneembaar zal zijn.
http://neo.jpl.nasa.gov/cgi-bin/db_shm?sstr=2004%20XP14
[ Bericht 4% gewijzigd door Frutsel op 28-06-2006 22:00:40 ]
Als je echt bang wilt worden. Op jupiter is een paar jaar geleden wel een komeet ingeslagen. de levy-shoemaker ofzoiets heette die komeet.
Hij heeft een krater achter gelaten ter grootte van de aarde.
Het is absoluut geen ver van je bed show.
Hij heeft een krater achter gelaten ter grootte van de aarde.
Het is absoluut geen ver van je bed show.
Communism will be conquered with the help of God ...and a few marines.
Absoluut niet, maar er is weinig aandacht voorquote:Op woensdag 28 juni 2006 23:43 schreef Monocultuur het volgende:
Als je echt bang wilt worden. Op jupiter is een paar jaar geleden wel een komeet ingeslagen. de levy-shoemaker ofzoiets heette die komeet.
Hij heeft een krater achter gelaten ter grootte van de aarde.
Het is absoluut geen ver van je bed show.
Elke dag kan er een 'rots' komen die we niet hebben zien aankomen... en er zijn filmpjes beschikbaar op het internet van 'near-misses'...
NASA to formulate ASTEROIDE DEFENSE plan
NASA has begun a fact-finding appraisal of how best to detect, track, catalog and characterize near-Earth asteroids and comets — and what can be done to deflect an object found on course to strike our planet.
The need to prepare is being highlighted this week as astronomers watch a large asteroid that will pass close to Earth on July 3.
Experts from a variety of fields are here this week at a NASA workshop on "Near-Earth Object Detection, Characterization and Threat Mitigation." The meeting is a unique, “idea gathering” event being carried out under direction of Congress. The intent is to provide lawmakers with an “executable program” — but also one that will clearly need funds to implement that program in an orderly and timely fashion.
NASA is on a fast track to give Congress an initial report by year’s end that will include an analysis of possible alternatives for diverting an object on a likely collision course with Earth.
Congress has tagged NASA to use its “unique competence” to deal with the potential hazard faced by Earth from such celestial wanderers, in order to help establish a warning and mitigation strategy.
Another chief agenda item on the table is putting in place the survey skills to spot near-Earth objects, or NEOs, that are equal to or greater than 460 feet (140 meters) in diameter. In plotting out that survey program, the merits of ground-based and space-based equipment are to be mulled over to achieve 90 percent completion of a NEO catalog within 15 years.
GLOBAL PROBLEM, NOT JUST NATIONAL
This week’s gathering is viewed by many as a turning point in shaping a NEO action plan.
“It is historic in the sense that it’s the first time the U.S. government has ever had a formal interest in the problem, in the global problem, that is, in the detection, tracking and beginning to look at the mitigation issues. I think that’s very significant,” said William Ailor of The Aerospace Corp., who is on the workshop’s mitigation working group.
A similar view is held by Russell Schweickart, former Apollo astronaut and chairman of the B612 Foundation. This group consists of scientists, technologists, astronomers, astronauts and other specialists who want to significantly alter the orbit of an asteroid in a controlled manner by 2015.
“This is really the first time that NASA will have ever put the words NASA and asteroid deflection together internally … so it’s a very positive move,” Schweickart told Space.com in a pre-workshop interview. He later advised workshop participants that “this isn’t a national issue … this is a planetary issue.”
Schweickart added that, given the likely scenario of decades of warning time, “this is not a last-minute search-and-destroy mission.”
UNFRIENDLY FIRE
There’s been no shortage of ideas how to fend off unfriendly fire from the cosmos: employing laser beams, space tugboats, gravity tractor or solar sails, for example, as well as using powerful anti-NEO bombs, conventional as well as nuclear.
Ailor, also director of The Aerospace Corp.’s Center for Orbital and Re-entry Debris Studies, told Space.com that creative ways to deflect Earth-harming NEOs are far from being exhausted.
“People have put a lot of concepts on the table over time,” Ailor said. “Now we’re beginning to try and develop an organized way of looking at those things and finding out which ones are really viable in the short-term, medium-term, and what technologies do we need to protect and develop for the long-term as well.”
A key message early in the workshop is that detection of NEOs is a first priority. The ongoing, three-part mantra agreed to by attendees is simple and direct: “Find them early … and find them early … and find them early.”
REALISTIC ALTERNATIVES
A likely setting is one where a modest Earth impact probability by a NEO is identified decades in advance — then, future mitigation technologies would be most appropriate.
Furthermore, “opportunity science” could be derived from such a response. NASA has an interest in harvesting NEOs for their minerals as well as siphoning from them water to further long-range space exploration goals.
Former shuttle astronaut Tom Jones, taking part in the meeting, has had a longstanding interest in asteroids.
“The NEO workshop this week is both informative — with the latest NEO data presented by experts in the field — and encouraging as the space agency seems intent on developing realistic alternatives for detecting most of the potentially hazardous NEOs,” he told Space.com. “That’s good … Congress expects NASA to answer the mail on how to deal with NEOs. This meeting is an important move forward in beginning to materially address the hazard.”
As a warning shot of sorts, several workshop attendees made note of next week’s close flyby of Earth of asteroid 2004 XP14. Discovered in late 2004, the space rock will slip by Earth on July 3, passing just beyond the moon’s average distance from Earth.
NASA has begun a fact-finding appraisal of how best to detect, track, catalog and characterize near-Earth asteroids and comets — and what can be done to deflect an object found on course to strike our planet.
The need to prepare is being highlighted this week as astronomers watch a large asteroid that will pass close to Earth on July 3.
Experts from a variety of fields are here this week at a NASA workshop on "Near-Earth Object Detection, Characterization and Threat Mitigation." The meeting is a unique, “idea gathering” event being carried out under direction of Congress. The intent is to provide lawmakers with an “executable program” — but also one that will clearly need funds to implement that program in an orderly and timely fashion.
NASA is on a fast track to give Congress an initial report by year’s end that will include an analysis of possible alternatives for diverting an object on a likely collision course with Earth.
Congress has tagged NASA to use its “unique competence” to deal with the potential hazard faced by Earth from such celestial wanderers, in order to help establish a warning and mitigation strategy.
Another chief agenda item on the table is putting in place the survey skills to spot near-Earth objects, or NEOs, that are equal to or greater than 460 feet (140 meters) in diameter. In plotting out that survey program, the merits of ground-based and space-based equipment are to be mulled over to achieve 90 percent completion of a NEO catalog within 15 years.
GLOBAL PROBLEM, NOT JUST NATIONAL
This week’s gathering is viewed by many as a turning point in shaping a NEO action plan.
“It is historic in the sense that it’s the first time the U.S. government has ever had a formal interest in the problem, in the global problem, that is, in the detection, tracking and beginning to look at the mitigation issues. I think that’s very significant,” said William Ailor of The Aerospace Corp., who is on the workshop’s mitigation working group.
A similar view is held by Russell Schweickart, former Apollo astronaut and chairman of the B612 Foundation. This group consists of scientists, technologists, astronomers, astronauts and other specialists who want to significantly alter the orbit of an asteroid in a controlled manner by 2015.
“This is really the first time that NASA will have ever put the words NASA and asteroid deflection together internally … so it’s a very positive move,” Schweickart told Space.com in a pre-workshop interview. He later advised workshop participants that “this isn’t a national issue … this is a planetary issue.”
Schweickart added that, given the likely scenario of decades of warning time, “this is not a last-minute search-and-destroy mission.”
UNFRIENDLY FIRE
There’s been no shortage of ideas how to fend off unfriendly fire from the cosmos: employing laser beams, space tugboats, gravity tractor or solar sails, for example, as well as using powerful anti-NEO bombs, conventional as well as nuclear.
Ailor, also director of The Aerospace Corp.’s Center for Orbital and Re-entry Debris Studies, told Space.com that creative ways to deflect Earth-harming NEOs are far from being exhausted.
“People have put a lot of concepts on the table over time,” Ailor said. “Now we’re beginning to try and develop an organized way of looking at those things and finding out which ones are really viable in the short-term, medium-term, and what technologies do we need to protect and develop for the long-term as well.”
A key message early in the workshop is that detection of NEOs is a first priority. The ongoing, three-part mantra agreed to by attendees is simple and direct: “Find them early … and find them early … and find them early.”
REALISTIC ALTERNATIVES
A likely setting is one where a modest Earth impact probability by a NEO is identified decades in advance — then, future mitigation technologies would be most appropriate.
Furthermore, “opportunity science” could be derived from such a response. NASA has an interest in harvesting NEOs for their minerals as well as siphoning from them water to further long-range space exploration goals.
Former shuttle astronaut Tom Jones, taking part in the meeting, has had a longstanding interest in asteroids.
“The NEO workshop this week is both informative — with the latest NEO data presented by experts in the field — and encouraging as the space agency seems intent on developing realistic alternatives for detecting most of the potentially hazardous NEOs,” he told Space.com. “That’s good … Congress expects NASA to answer the mail on how to deal with NEOs. This meeting is an important move forward in beginning to materially address the hazard.”
As a warning shot of sorts, several workshop attendees made note of next week’s close flyby of Earth of asteroid 2004 XP14. Discovered in late 2004, the space rock will slip by Earth on July 3, passing just beyond the moon’s average distance from Earth.
Tis alweer 12 jaar geleden dat shoemaker-levy "insloeg" op Jupiter.quote:Op woensdag 28 juni 2006 23:43 schreef Monocultuur het volgende:
Als je echt bang wilt worden. Op jupiter is een paar jaar geleden wel een komeet ingeslagen. de levy-shoemaker ofzoiets heette die komeet.
Hij heeft een krater achter gelaten ter grootte van de aarde.
En omdat Jupiter een gas planeet is, kunnen er geen
(zichtbare) kraters ontstaan.
Dus Krater is het verkeerd woord ervoor.
De sporen van de impact waren wel te zien
Asteroid Spotting: Skywatchers to Glimpse Close Flyby
[ Bericht 7% gewijzigd door -CRASH- op 30-06-2006 23:27:52 ]
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Is er niet eens een kansje dat zo'n steen tegen de maan aan dendert?? Dat is natuurlijk wel spektakel om dat te gaan kijken. Boeiender als een felle ster die langsvliegt...
LastFM
03/06 Maccabees - 10/06 Gaslight Anthem - 18/06 Oi Vai Voi - 20/06 Green Beats - 24/06 Ghinzu - 18/07 Extrema Outdoor
03/06 Maccabees - 10/06 Gaslight Anthem - 18/06 Oi Vai Voi - 20/06 Green Beats - 24/06 Ghinzu - 18/07 Extrema Outdoor
De kans is er altijd....quote:Op zondag 27 augustus 2006 17:13 schreef -skippybal- het volgende:
Is er niet eens een kansje dat zo'n steen tegen de maan aan dendert?? Dat is natuurlijk wel spektakel om dat te gaan kijken. Boeiender als een felle ster die langsvliegt...
Vorige week nog zijn er waarnemingen
geweest van meteoriet inslagen op de Maan.
Maar dat waren redelijk kleintjes.
En als er een grote asteroide/komeet/meteor de Maan aan gruzelementen knalt.quote:IMPACT MOON:
In only 30 hours of observing, astronomers at the Marshall Space Flight Center have recently photographed seven explosions of light on the Moon. Each one, they believe, was caused by a meteoroid falling from the sky and hitting the ground.
Above: Candidate meteoroid impact sites
The flashes seen by the Marshall group ranged in brightness from 7th to 9th magnitude, which means they were invisible to the human eye, but easy targets for backyard telescopes. Amateur astronomers are thus invited to join the hunt.
FAQ: The Moon has no oxygen to support fires or explosions. So what causes these flashes of light?
Answer: The source of the light is not combustion, which would require oxygen, but rather the simple heating of rocks and soil at the impact site. Even small meteoroids carry a lot of kinetic energy because they travel so fast, some in excess of 100,000 mph. When they hit the ground, all that kinetic energy gets converted into thermal energy. Rocks and soil are heated to such high temperatures that they glow--hence the flash of light.
Dan is het met de Aarde ook afgelopen.
Niet alleen door de puin die valt. Maar ook de stabilieteit van de Aarde is weg.
En dat is erger ,dan dat er eentje op de Aarde terechtkomt.
[ Bericht 3% gewijzigd door -CRASH- op 27-08-2006 17:44:45 ]
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ik hoop echt dat ik nog eens mag mee maken dat een echte grote meteoriet op aarde neerknalt.
ik ben niet suicidaal, maar daar maak ik een uitzondering voor.
ik ben niet suicidaal, maar daar maak ik een uitzondering voor.
Communism will be conquered with the help of God ...and a few marines.
LONDEN - Een asteroïde stormt met een snelheid van 45.000 kilometer per uur op de aarde af en dreigt in te slaan. De Amerikaanse ruimtevaartorganisatie NASA stuurt een bemande vlucht naar de asteroïde, die de ruimterots een zetje geeft en de planeet redt van een zekere ondergang.
Het klinkt als het script voor een Hollywood-film, maar de NASA beschouwt een mogelijke asteroïde-inslag als een serieuze dreiging voor de aarde. Daarom wil de organisatie onderzoeken of menselijk ingrijpen in een dergelijk geval mogelijk is, meldde The Guardian vrijdag.
Het leven op aarde is waarschijnlijk al twee keer eerder vrijwel uitgeroeid door de inslag van een gigantische meteoriet. Deskundigen houden er rekening mee, dat de aarde nog eens in botsing komt met een ruimterots. De kleine asteroïde Apophis bevindt zich bijvoorbeeld in een baan die het rotsblok in 2036 bij de aarde brengt.
Wanneer een grote asteroïde van een miljard ton zou inslaan in de aarde, zou dat vergelijkbaar zijn met de explosie van een waterstofbom van 50.000 megaton. Wanneer de ruimterots voor de inslag zou worden verpulverd met een kernraket, zou dat een grote hoeveelheid kleine rotsen opleveren die nog altijd op de aarde afdenderen.
Daarom denken wetenschappers dat het beter zou zijn de koers van het hemellichaam te wijzigen. Dat zou kunnen door de absorptie van licht en warmte van de asteroïde te beïnvloeden met spiegels en lichten. Een astronaut zou de asteroïde een zetje kunnen geven door er een apparaat op te plaatsen dat iets afvuurt, waardoor een terugslag ontstaat en de asteroïde de andere kant op beweegt.
Tot nu toe is het onmogelijk een astronaut zo ver de ruimte in te sturen. Daarvoor zou een speciale raket nodig zijn, die vooralsnog alleen op de tekentafel bestaat.
*Bron: Trouw/Telegraaf
[ Bericht 19% gewijzigd door Frutsel op 17-11-2006 12:38:52 ]
Het klinkt als het script voor een Hollywood-film, maar de NASA beschouwt een mogelijke asteroïde-inslag als een serieuze dreiging voor de aarde. Daarom wil de organisatie onderzoeken of menselijk ingrijpen in een dergelijk geval mogelijk is, meldde The Guardian vrijdag.
Het leven op aarde is waarschijnlijk al twee keer eerder vrijwel uitgeroeid door de inslag van een gigantische meteoriet. Deskundigen houden er rekening mee, dat de aarde nog eens in botsing komt met een ruimterots. De kleine asteroïde Apophis bevindt zich bijvoorbeeld in een baan die het rotsblok in 2036 bij de aarde brengt.
Wanneer een grote asteroïde van een miljard ton zou inslaan in de aarde, zou dat vergelijkbaar zijn met de explosie van een waterstofbom van 50.000 megaton. Wanneer de ruimterots voor de inslag zou worden verpulverd met een kernraket, zou dat een grote hoeveelheid kleine rotsen opleveren die nog altijd op de aarde afdenderen.
Daarom denken wetenschappers dat het beter zou zijn de koers van het hemellichaam te wijzigen. Dat zou kunnen door de absorptie van licht en warmte van de asteroïde te beïnvloeden met spiegels en lichten. Een astronaut zou de asteroïde een zetje kunnen geven door er een apparaat op te plaatsen dat iets afvuurt, waardoor een terugslag ontstaat en de asteroïde de andere kant op beweegt.
Tot nu toe is het onmogelijk een astronaut zo ver de ruimte in te sturen. Daarvoor zou een speciale raket nodig zijn, die vooralsnog alleen op de tekentafel bestaat.
*Bron: Trouw/Telegraaf
[ Bericht 19% gewijzigd door Frutsel op 17-11-2006 12:38:52 ]
denk dat tegen die tijd het allemaal begint te naderen de mensheid wel es een keer al zijn problemen en oorlogen wellicht opzij zet en samen (of iig iemand) er iets aandoet om het te verkomen. Dat kapot nuken moet best kunnen voor me idee, omdat heel wat verbrand als het klein is zodra het binnen de dampkring komt en anders een soort van afkaatsing/afbuiging (spiegels gebruiken om meer energie toe te voegen aan de meteoriet voor afbuiging)
