Astronomy Picture of Day: A Hole in Mars# Astronomy - 天文
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A Hole in Mars
Credit: NASA, JPL, U. Arizona
Explanation: Black spots have been discovered on Mars that are so dark that
nothing inside can be seen. Quite possibly, the spots are entrances to deep
underground caves capable of protecting Martian life, were it to exist. The
unusual hole pictured above was found on the slopes of the giant Martian
volcano Arsia Mons. The above image was captured three weeks ago by the
HiRISE instrument onboard the Mars Reconnaissance Orbiter currently circling
Mars.
Credit: NASA, JPL, U. Arizona
Explanation: Black spots have been discovered on Mars that are so dark that
nothing inside can be seen. Quite possibly, the spots are entrances to deep
underground caves capable of protecting Martian life, were it to exist. The
unusual hole pictured above was found on the slopes of the giant Martian
volcano Arsia Mons. The above image was captured three weeks ago by the
HiRISE instrument onboard the Mars Reconnaissance Orbiter currently circling
Mars.