NASA’s Mars Rover has captured something interesting: a door. That’s what it looks like, at least…an entrance that looks something like we’ve seen outside tombs in Egypt. But sorry alien watchers…mission scientists say it's a natural feature. "This is a very curious image," British geologist Neil Hodgson, who has studied the geology of Mars, told “Live Science.” "But in short – it looks like natural erosion to me." Among the facts scientists say point to it NOT being “a door?” It’s about three-feet high and that other images show that it’s more like a fracture between rocks.