MARS - de missies (DEEL 4)

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Op woensdag 23 juni 2004 14:17 schreef Marvin-THE-MARTiAN het volgende:
[afbeelding]
The Valles Marineris Canyon
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Op maandag 5 juli 2004 10:00 schreef Doffy het volgende:
Goud, zilver, diamanten! Laat me erbij! Ik ga naar Mars, nu!

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It rained on Mars -- three billion years ago
PARIS (AFP) Jul 01, 2004

Mars was not only awash with water, it also once had rainfall, according to a French study published on Friday.

The evidence comes from infra-red imaging, which probed under dust deposited over the millions of years and found dense networks of dry valleys, whose branching bear the hallmarks of having been carved out by rain.

The conventional theory is that Mars had a balmy climate during its infancy, a period called the Noachian era, in which vast volumes of water flowed on its surface, cutting valleys and eroding the craters left by asteroids. Then, around 3.6 billion years ago -- coincidentally, just when the first signs of life emerged on Earth -- the planet froze, entering the so-called Hesperian epoch, which lasted around half a billion years. What remained as water has almost always been locked up as ice, either at the poles or (so it is hoped) close to the surface, according to this theory.

The French study, led by Nicolas Mangold of the University of Paris South, contends though that the rain-carved valleys date from near the end of the Hesperian -- at a time when the temperature was, supposedly, far too cold to permit precipitation.

Their analysis is based on data sent back the thermal Emission Imaging System (THEMIS), which has been scanning the planet since October 2001 aboard a NASA orbiter, Mars Odyssey.

THEMIS\' images show images of valleys with extensive branching, typical of the erosion on Earth caused by rainwater, as well as meandering curves and inner channels on the valley floors.

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Ammonia on Mars could mean life

Ammonia may have been found in Mars' atmosphere which some scientists say could indicate life on the Red Planet.
Researchers say its spectral signature has been tentatively detected by sensors on board the European Space Agency's orbiting Mars Express craft.

Ammonia survives for only a short time in the Martian atmosphere so it must be getting constantly replenished.

There are two possible sources: either active volcanoes, none of which have been found yet on Mars, or microbes.

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Op zondag 18 juli 2004 23:24 schreef NorthernStar het volgende:
Wel of niet?
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volledige artikel -> BBC News

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One possibility the scientists had to rule out was that the ammonia came from the air bags of the failed Beagle 2 mission. Analysis revealed that the ammonia's distribution was not consistent with this explanation.

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One possibility the scientists had to rule out was that the ammonia came from the air bags of the failed Beagle 2 mission. Analysis revealed that the ammonia's distribution was not consistent with this explanation.

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Op maandag 19 juli 2004 00:19 schreef Boondock_Saint het volgende:

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Hoe bepalen ze zoiets precies? Ik bedoel ammoniak is toch ammoniak (NH3 als ik me niet vergis ). Hoe weten ze zeker dat deze ammoniak niet uit de airbags komt?

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Op maandag 19 juli 2004 00:19 schreef Boondock_Saint het volgende:

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Hoe bepalen ze zoiets precies? Ik bedoel ammoniak is toch ammoniak (NH3 als ik me niet vergis ). Hoe weten ze zeker dat deze ammoniak niet uit de airbags komt?

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Analysis revealed that the ammonia's distribution was not consistent with this explanation.

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Op maandag 2 augustus 2004 01:14 schreef -CRASH- het volgende:
Ik hoor/zie net op BBC 1 (the sky at night)
dat ze in de atmosfeer van Mars methaan en
amonia sporen hebben gevonden.....
Dat van vulkanisme of mogelijke microben afkomt.