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Astronomy Picture of the Day
Gibbous Europa
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zorg.ch
#112962
by
[z]Barbara Harris
@
31.01.2011 00:00
- nach oben -
Gibbous Europa
Explanation: Although the
phase
of this moon might appear familiar, the moon itself might not. In fact, this
gibbous phase
shows part of
Jupiter
's moon
Europa
. The robot spacecraft
Galileo
captured
this image
mosaic during its mission orbiting Jupiter from 1995 - 2003. Visible are
plains
of
bright ice
,
cracks
that run to the horizon, and
dark patches
that likely contain both ice and dirt.
Raised terrain
is particularly apparent near the
terminator
, where it casts
shadows
.
Europa
is nearly the same size as
Earth's Moon
, but much smoother, showing few
highlands
or
large impact craters
. Evidence and images from the
Galileo spacecraft
, indicated that liquid oceans
might exist
below the icy surface. To test speculation that these seas hold life, NASA and
ESA
have started preliminary development of the
Europa Jupiter System Mission
, a
spacecraft proposed
for launch around 2020 that would further explore Jupiter and in particular Europa. If the surface ice is thin enough, a future mission might drop
hydrobots
to burrow into the oceans and search for life. Browse:
See the latest images submitted to APOD
Credit & Copyright