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Astronomy Picture of the Day
Water Ice in a Martian Crater
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zorg.ch
#77175
by
[z]Barbara Harris
@
21.07.2005 00:00
- nach oben -
Water Ice in a Martian Crater
Explanation:
What lies on the floor of this Martian crater?
A frozen patch of water ice.
The robotic
Mars Express
spacecraft took the
above image
in early February.
The ice pocket was found in a 35-kilometer
wide crater that resides 70 degrees north of the
Martian equator
.
There, sunlight is blocked by the 300-meter tall
crater wall from
vaporizing
the water-ice on the
crater floor into the
thin Martian atmosphere
.
The ice pocket may be as deep as 200 meters thick.
Frost can be seen around the inner edge on the upper right part of the
crater
, while part of the lower left
crater wall is bathed in sunlight.
The existence of water-ice pockets inside craters near the
Martian North Pole
, like that
pictured above
and
others noted previously
, give clues not only about
surface conditions in the Martian past but also
possible places
where future
water-based astronauts
might do well to land.
Credit & Copyright
zorg.ch
#77190
by
hans
@
21.07.2005 17:34, edited @
21.07.2005 17:35
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krass en schoggi-donut mit schlagrahm i dä mitti
zorg.ch
#77294
by
Cédi
@
23.07.2005 14:42
- nach oben -
und denn kein chline
zorg.ch
#77193
by
Buezi
@
21.07.2005 20:05
- nach oben -
hrr hrr