Images taken by a Mars-orbiting spacecraft show what appear to be cave entrances on the Red Planet. By sheltering organisms from such hazards as ultraviolet radiation and micrometeoroid bombardment, caves “could be among the only places on Mars to find evidence of past or present microbial life,” says Glen Cushing of the U.S.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.