Astronomy Picture of the Day . Asteroid 2012 DA14 Passes the Earth . ... That small spot moving in front of background stars in the above video is a potentially dangerous asteroid passing above the Earth's atmosphere. ... Lemmon's lime green coma and thin tail are near the left edge of this telephoto scene, a single frame from a timelapse video (vimeo here) recorded on February 12, tracking its motion against the background stars. ... Reflected Aurora Over Alaska . ... Asteroids in the Distance . ...