NASA's Perseverance rover has encountered another rock on Mars that has left scientists puzzled.

Among the weirder photos are ones purporting to show an "alien boot," a flying UFO, a mysterious doorway, metallic wreckage, ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Perseverance acquired this image of the "St. Pauls Bay" target (the dark-toned float block in ...