Mars, Underground | Mark Betancourt | Air & Space | 1st July 2016

“Why explore extraterrestrial caves? Partly for the same reasons scientists venture into caves on Earth. They’re protected from weather and from meteoric bombardment. Liquid water on Mars is likely to exist underground, at depths where ice is melted by warmth from the planet’s interior. They offer protection from radiation. If life moved underground to escape, caves are a good place to look for fossil evidence of their tenancy. It’s even possible that in some Martian caves, life still exists”