abonnementen ibood.com bol.com Gearbest
  donderdag 27 april 2017 @ 14:26:12 #176
442280 Prisha
Live life!
pi_170521045
(Nasa)

At approximately 3 a.m. EDT on April 27, ground controllers detected the carrier signal from the Cassini spacecraft and were waiting for NASA's Deep Space Network to lock on to the signal, after which engineering data related to the state of the spacecraft are expected to begin flowing in.

The spacecraft made its first dive through the narrow gap between Saturn and its rings on April 26. Because that gap is a region no spacecraft has ever explored, Cassini used its dish-shaped high-gain antenna (13 feet or 4 meters across) as a protective shield while passing through the ring plane. No particles larger than smoke particles were expected, but the precautionary measure was taken on the first dive. The Cassini team will use data collected by one of the spacecraft’s science instruments (the Radio and Plasma Wave Subsystem, or RPWS) to ascertain the size and density of ring particles in the gap in advance of future dives. As a result of its antenna-forward orientation, the spacecraft will be out of contact with Earth during the dive.

Likely no earlier than 3:30 a.m. EDT (12:30 a.m. EDT), images are scheduled to become available from the spacecraft.
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
  donderdag 27 april 2017 @ 14:29:34 #177
442280 Prisha
Live life!
pi_170521080
These unprocessed images show features in Saturn's atmosphere from closer than ever before. The view was captured by NASA's Cassini spacecraft during its first Grand Finale dive past the planet on April 26, 2017. Credit: NASA/JPL-Caltech/Space Science Institute

s3d5pk.jpg
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170521681
quote:
0s.gif Op donderdag 27 april 2017 14:29 schreef Prisha het volgende:
These unprocessed images show features in Saturn's atmosphere from closer than ever before. The view was captured by NASA's Cassini spacecraft during its first Grand Finale dive past the planet on April 26, 2017. Credit: NASA/JPL-Caltech/Space Science Institute

[ afbeelding ]
_O_ _O_ _O_
Death Makes Angels of us all
And gives us wings where we had shoulders
Smooth as raven' s claws...
pi_170521840
W00106474.jpg
<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>
pi_170522938
wat gaaf _O_ ^O^
  donderdag 27 april 2017 @ 20:27:10 #181
167383 Molurus
the talking snake
pi_170528141
Vet! ^O^
Philosophy: questions that may never be answered.
Religion: answers that must never be questioned.
  donderdag 27 april 2017 @ 21:13:17 #182
94257 aloa
Steeds harder, steeds sneller
pi_170529471
<a href="https://youtu.be/qJUnxitTW2A" target="_blank" rel="nofollow">Katrina</a>
100.000e
pi_170537715
27-04-2017

Ruimtesonde Cassini heeft eerste snoekduik goed doorstaan

2a2553736a0584a37f66351837afa505.jpg
Artist’s impression van de ruimtesonde Cassini, terwijl deze op het punt staat om in het ‘gat’ tussen de planeet Saturnus en diens ringenstelsel te duiken. (NASA/JPL-Caltech)

Er is weer contact met NASA-ruimtesonde Cassini na diens succesvolle eerste duik door de (relatief) smalle opening tussen de planeet Saturnus en zijn ringen. Cassini is momenteel bezig om de wetenschappelijke en technische gegevens die daarbij zijn verzameld naar de aarde over te seinen.

Tijdens zijn duik, die gisterochtend plaatsvond, is de ruimtesonde het wolkendek van Saturnus tot op 3000 kilometer genaderd en de binnenste grens van het ringenstelsel tot op 300 kilometer. Daarbij had hij ten opzichte van de planeet een snelheid van ongeveer 124.000 km/uur.

De komende maanden zal Cassini nog 21 van deze snoekduiken maken. De eerstvolgende staat gepland voor 2 mei. (EE)

(allesoversterrenkunde)
Death Makes Angels of us all
And gives us wings where we had shoulders
Smooth as raven' s claws...
  vrijdag 28 april 2017 @ 10:03:53 #184
94257 aloa
Steeds harder, steeds sneller
pi_170538544
<a href="https://youtu.be/qJUnxitTW2A" target="_blank" rel="nofollow">Katrina</a>
100.000e
pi_170538556
Wauw
10.000 katjes
Maakte de 100.000e post in BIT
Er eens op uit?
pi_170541277
Geiser activiteit op EnceladusN00280321.jpg
<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>
  vrijdag 28 april 2017 @ 20:36:26 #187
442280 Prisha
Live life!
pi_170550713
quote:
0s.gif Op vrijdag 28 april 2017 12:53 schreef -CRASH- het volgende:
Geiser activiteit op Enceladus[ afbeelding ]
ah dit zijn toch geweldige beelden O+
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170563154
quote:
0s.gif Op vrijdag 28 april 2017 20:36 schreef Prisha het volgende:

[..]

ah dit zijn toch geweldige beelden O+
Deze vind ik heel mooi.
Van 2 kanten beschenen
N00280529.jpg
<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>
  zaterdag 29 april 2017 @ 21:05:10 #189
442280 Prisha
Live life!
pi_170571851
quote:
0s.gif Op zaterdag 29 april 2017 14:21 schreef -CRASH- het volgende:

[..]

Deze vind ik heel mooi.
Van 2 kanten beschenen
[ afbeelding ]
Heel erg mooi inderdaad O+
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170606439
Nog een RAW van 29 April

Enceladus en Saturnus
W00107150.jpg
<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>
pi_170607006
_O_ _O_
Death Makes Angels of us all
And gives us wings where we had shoulders
Smooth as raven' s claws...
  dinsdag 2 mei 2017 @ 09:43:40 #192
442280 Prisha
Live life!
pi_170626978
quote:
0s.gif Op maandag 1 mei 2017 13:18 schreef -CRASH- het volgende:
Nog een RAW van 29 April

Enceladus en Saturnus
[ afbeelding ]
^O^ O+

en dan zijn er mensen die dit saaie beelden vinden 8)7
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
  dinsdag 2 mei 2017 @ 10:14:52 #193
442280 Prisha
Live life!
pi_170627427
Er werd veel meer stof verwacht dan dat er uiteindelijk was.

"The region between the rings and Saturn is 'the big empty,' apparently," said Cassini Project Manager Earl Maize of NASA's Jet Propulsion Laboratory in Pasadena, California. "Cassini will stay the course, while the scientists work on the mystery of why the dust level is much lower than expected."

Vergelijking tussen een eerdere ring crossing in December en de duik tussen planeet en ringen op 26 April:

Data collected by the Radio and Plasma Wave Science instrument on NASA's Cassini spacecraft, as it crossed the plane of Saturn's rings on Dec. 18, 2016 and as it crossed through the gap between Saturn and its rings on April 26, 2017, during the first dive of the mission's Grand Finale. The instrument is able to record ring particles striking the spacecraft in its data.

1zn0c45.jpg
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
  donderdag 4 mei 2017 @ 09:26:19 #194
442280 Prisha
Live life!
pi_170674855
Nieuwe YouTube van Nasa: Cassini's First Fantastic Dive Past Saturn

If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170675101
quote:
0s.gif Op donderdag 4 mei 2017 09:26 schreef Prisha het volgende:
Nieuwe YouTube van Nasa: Cassini's First Fantastic Dive Past Saturn

^O^ _O-
<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>
  donderdag 4 mei 2017 @ 09:58:43 #196
442280 Prisha
Live life!
pi_170675443
quote:
0s.gif Op donderdag 4 mei 2017 09:40 schreef -CRASH- het volgende:

[..]

^O^ _O-
ik ben gewoon enthousiast moet het toch ergens kwijt :@ _O- ....call me crazy :P
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170677469
quote:
0s.gif Op donderdag 4 mei 2017 09:58 schreef Prisha het volgende:

[..]

ik ben gewoon enthousiast moet het toch ergens kwijt :@ _O- ....call me crazy :P
Wie niet 8)7
Bij dit soort beelden :9~
Ik zag de video vanmorgen ook op m'n FB pagina staan..
Maar met een kleurenfoto onder de headline.
<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>
pi_170681263
I worked on NASA's Saturn mission for 28 years — here's why we must go back after Cassini is destroyed
Andrew Coates, The Conversation

newrings_cassini_big.jpg
NASA/JPL-Caltech/Space Science Institute

quote:
It's the slow beginning of what will be a violent end for the Cassini mission.
At 2:00 a.m. EDT on April 26, the spacecraft became the first ever to dive between Saturn and its spectacular innermost ring. This marks the start of its "grand finale" consisting of 22 daring orbits — enabling a new era of science. Then, on September 15, it will crash into the planet's atmosphere and burn up. It is sure to be a sad but proud moment for those of us who have worked on the mission.

Cassini was initially set on its path to destruction on April 22 when it flew by Saturn's moon Titan.
The spacecraft has used Titan not just as a fascinating scientific target in itself, but also to provide the gravitational slingshots needed to tweak, crank and change its orbit. It is Titan that gave it the impetus to penetrate the 2,400km gap between the rings and the planet every week before the mission ends.
During the next few months, the instrument teams have several new observations to make in this region. These include understanding a new radiation belt discovered inside the rings early in the mission and taking close-up pictures of the rings and other features.

It will also image Saturn's cloud tops at close range, weigh its ring system (which will indicate just how old it is), sample the atmosphere of the planet and its rings, and measure Saturn's internal structure.

Hazardous journey

But there are risks.
The ring plane includes a lot of particles. These vary from micron-sized grains (a millimeter is equal to 1,000 microns) to mansion-sized chunks — and they could all collide with the spacecraft. Although Cassini's path in the gap between Saturn and the rings has fewer particles than in the visible rings, we don't know exactly how few.
However, it is thought that the risks of a significant dust hit in the ring plane are low. At the large relative speed — a maximum of 124,000km per hour — a hit could be a significant problem for the spacecraft.

So, as Cassini flies through the ring plane, its high-gain antenna will be oriented to provide a shield for the rest of the spacecraft and its instruments. This was successfully done early in the mission when it was first inserted into orbit around Saturn, crossing outside the main rings.
The only protruding features beyond the shield are a 10-metre electric field antennae and an 11-metre magnetometer boom (used to make magnetic observations). These should make it possible to monitor dust impacts, each of which makes a tiny plume of plasma (loose and electrically charged particles) as the spacecraft and booms are impacted. Hopefully, no large impact will disable the spacecraft.

Indeed, the best computer models show that this should not happen. But even if it does, the spacecraft will eventually crash into Saturn — as it's supposed to. That is important. Cassini must not crash onto interesting targets in the quest to find extraterrestrial lifeforms — particularly the moons Enceladus and Titan. These are subject to "planetary protection" which means we cannot put probes there which could carry contamination from Earth in the form of microbes.

The spacecraft will be useful until the very moment it burns up — it will be sending back data continuously. These last measurements of the composition of Saturn's atmosphere, rotation rate and interior structure will be totally unique.

Personal highlights

I've been privileged to work on Cassini for 28 years. We proposed our instrument, the electron spectrometer, which measures the energy and direction of electrons, in 1989, and were selected to develop it in 1990. We then secured funding, and built, tested and calibrated the instrument before the launch in 1997.
The launch itself was a tense time. The powerful Titan IV rocket lifted off near dawn in October 1997, went behind a cloud from our vantage point and then thankfully emerged serenely on its way to Saturn, reaching the planet on July 1 2004. I remember nervously watching in the middle of the night as Cassini burned its engines for an excruciating 96 minutes to slow the spacecraft into Saturn orbit. Luckily it all went smoothly.
Cassini has operated at Saturn for almost half a Saturn year. It's made many discoveries — in fact, it has rewritten the textbooks on the Saturn system. We now know that Saturn has 45 more moons than previously thought — placing the total now at 62.
At Titan, Cassini found prebiotic chemistry — which means the moon is essentially a frozen version of what the Earth was several billion years ago. Cassini also discovered that the moon has three large seas and a number of smaller lakes made of liquid methane.

At Enceladus, Cassini discovered water-rich plumes from a subsurface ocean and found that the ocean is salty. It recently also confirmed that chemical reactions between water and rock on the moon can provide enough energy in the water to feed microbial life. There have been many other incredible discoveries about the other icy moons, the atmosphere and the magnetosphere.

Some of the key discoveries we made with the electron spectrometer include large amounts of hydrocarbons and nitriles (a form of organic compound) in Titan's atmosphere.
These fall through the atmosphere and may form the dunes seen on Titan's surface.

We also uncovered Saturn's ring atmosphere and ionosphere, and found weak atmospheres at the moons Rhea and Dione. An important discovery was that of water clusters and charged dust particles in plumes at Enceladus, helping us to understand that it has a subsurface ocean.
Needless to say, it has truly been an honor to be a part of the Cassini mission and a privilege to work with colleagues, postdocs and students through the years.

As the mission heads towards its end, the overwhelming feeling is that this has been one of humankind's most spectacular voyages of discovery.

But there are tantalizing discoveries yet to be made.
Enceladus has just recently joined Mars and Jupiter's moon Europa in the top three likely locations for life beyond Earth in our solar system. I'm involved in the continued search for life on Mars with the ExoMars 2020 rover and at Jupiter's icy moons with the JUICE mission. NASA also plans the Europa Clipper mission.
Now, Cassini has shown us that we must go back to Titan and Enceladus, too.

<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>
  donderdag 4 mei 2017 @ 14:16:34 #199
442280 Prisha
Live life!
pi_170681832
quote:
0s.gif Op donderdag 4 mei 2017 11:36 schreef -CRASH- het volgende:

[..]

Wie niet 8)7
Bij dit soort beelden :9~
Ik zag de video vanmorgen ook op m'n FB pagina staan..
Maar met een kleurenfoto onder de headline.
Ja! Je begrijpt t ^O^
If you gaze long into an abyss, the abyss also gazes into you - Nietzsche
pi_170686440
quote:
0s.gif Op donderdag 4 mei 2017 09:26 schreef Prisha het volgende:
Nieuwe YouTube van Nasa: Cassini's First Fantastic Dive Past Saturn

:~
DeLuna vindt me dik ;(
Op zondag 22 juni 2014 12:30 schreef 3rdRock het volgende:
pas als jullie gaan trouwen. nu ben je gewoon die Oom Rubber die met onze mama leuke dingen doet :)
abonnementen ibood.com bol.com Gearbest
Forum Opties
Forumhop:
Hop naar:
(afkorting, bv 'KLB')