Ride Along With the Halloween Asteroid TB145 As It Glides Across the Stars

On Halloween day, the 600-meter-wide asteroid (or dead comet?) 2015 TB145 slid past the Earth at a distance of about 480,000 km. That's pretty close as interplanetary distances go, but still comfortably farther then the Moon from Earth. Not only were we in no danger from this rock, but it provided eager astronomers an opportunity to observe it. Radar observations with the huge Arecibo telescope showed it to be round -- skull-shaped, in fact! -- and rotating once every five hours or so. But you d...