Nasa finds mysterious ‘Skull Hill’ on Mars and doesn’t know where it came from

The dark stone looks different to the usual Red Planet rocks (Picture: Nasa/JPL-Caltech/ASU)Mars may be our nearest neighbour, but there’s a lot up there which we have no idea about.
Astronomers and conspiracy theorists have been busy spotting strange things on the surface for decades – from a dildo to a ‘giant mouse’, human bones and even the Star Trek logo.
Most of these sightings are complete fantasy based purely on rocks looking a bit funny, like that time peopl