SpaceWhy bringing Martian rocks back to Earth is a bad idea There are plans to return samples from Mars to check them for signs of life, but we should examine them before they reach our planet, says Paul MarksComment
SpaceMars’s crust may have sucked up most of the planet’s water Mars used to be covered in water, but it dried out billions of years ago. A lot of that water may have been irreversibly sucked up and turned into minerals in the ground News