A simulated tornado, ghosts at NASA's Goddard Space Flight Center, and other amazing images of the week

Chile's Atacama Desert contains Earth's closest Mars-like conditions: It's extremely dry with high UV radiation from the sun. So naturally, NASA has made the area it's go-to practice facility for tests and experiments that they may one day perform on the red planet. Recently, scientists from NASA's Atacama Rover Astrobiology Drilling Studies completed their second season of tests. The tested KREX-2 rover was able to rove, drill, and detect life signs all at the same time. Such multi-tasking robotic rovers could ultimately help scientists to figure out if there was (or still is) microbial life forms under Mars' surface.