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August 30, 2011 Hole in One
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Sunlight casts a crescent shadow on the floor of an underground cavern in a recently released picture of a Martian "skylight." This round opening likely leads to a lava tube, which is created when lava solidifies on the surface but keeps flowing underground. Eventually the lava drains away, leaving an empty cave. Snapped by NASA's Mars Reconnaissance Orbiter, the picture revealed that the skylight is 115 feet (35 meters) across. The shadow helped scientists calculate that the cave floor is about 65 feet (20 meters) below the surface. |
Image courtesy U-Arizona/NASA
Gravdigr Tuesday Aug 30 04:49 PM
MARS GOT ZITS!!!
SPUCK Friday Sep 2 05:15 AM
That's a lake in there...
Gravdigr Friday Sep 2 06:07 PM
Wait...are you suggesting that there's
Gravdigr Friday Sep 2 06:08 PM
Sorry, couldn't resist.
SPUCK Saturday Sep 3 04:58 AM
See it's true!!!
Griff Saturday Sep 3 09:24 AM
Ha! Nice one.
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