On my morning stroll through the internet, I found an article at BBC News about cave entrances being possibly spotted on Mars. I love exploring caves here on earth, but caves on Mars, now that would be fun! If I remember correctly, the surface gravity on Mars is around 38 to 40% of what it is on earth, and would allow for some easier navigation through 'those tight spots' inside a cave where there is an unfavorable slope angle.
A portion:
The candidate caves are on the flanks of the Arsia Mons volcano and are of sufficient depth their floors mostly cannot be seen through the opening.
Details were presented here at the Lunar and Planetary Science Conference in Houston, Texas.
Temperature data from Mars Odyssey's Themis instrument support the idea.
The authors say that the possible discovery of caves on the Red Planet is significant.
The caves may be the only natural structures capable of protecting primitive life forms from micrometeoroids, UV radiation, solar flares and high energy particles that bombard the planet's surface.
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