SpaceAn asteroid strike may have popped the surface of Mars An unusually round and symmetrical deposit on Mars may be the result of an impact that popped the surface of the planet, causing a volcanic eruption less than 200,000 years ago News
SpaceMercury’s outer layers may have been stripped off by a young Venus Mercury is mostly iron, which may be because a series of close encounters with a young Venus billions of years ago stripped away its rocky outer layers News