Caves could reveal secrets of life on Mars
‘Virtual spelunking” finds possible cave system in Martian volcano flows A series of depressions discovered on Mars could be entrances to a cave system that might provide shelter for future Mars missions or shed light on whether microbial life forms have ever existed on the “Red Planet.” Glen Cushing, a physicist with the US Geological Survey, discovered the series of “collapse depressions” in extinct lava flows from a Martian volcano. Cushing describes his discovery as a collection of “long grooves” in the surface with distinctive depressions that appear to be skylight entrances into tunnel-like structures. Some of the grooves are more than 100 kilometers long and could easily extend much further and deeper beneath the surface.
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