This Friday, an asteroid nearly three kilometers wide is going to pass by the Earth-Moon system. The fly-by is harmless — at its closest, the asteroid will be about 15 times farther from us than the Earth is from the Moon — but to mark the event, the White House will host the second in a series of "We the Geeks" Google+ Hangouts to talk asteroids with Bill Nye the Science Guy, former astronaut Ed Lu, NASA Deputy Administrator Lori Garver, and more.
