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Possible cave entrances on Mars

Possible cave entrances on Mars
Possible cave entrances on Mars Seven dark spots seen in Mars Odyssey THEMIS images could be the entrances to underground caves on Mars. The researchers who identified these caves have given them the following names:
Dena (-6.084 N, 239.061 E)
Chloe (-4.926 N, 239.193 E)
Wendy (-8.099 N, 240.242 E)
Annie (-6.267 N, 240.005 E)
Abbey & Nikki (-8.498 N, 240.349 E)
Jeanne (-5.636 N, 241.259 E) NASA / JPL-Caltech / UA / Cushing et al. (2007)