Nasa scientists have recreated Martian 'spiders' in laboratory conditions for the first time, simulating Mars' extreme temperatures and air pressure. Known as araneiform terrain, these formations were first observed in 2003.

When you buy through links on our articles, Future and its syndication partners may earn a commission. Mars spiders have arrived on Earth. But fear not, arachnophobes — these "spiders" aren't actual arachnids, but spider-like geological formations on the ...