Halloween Asteroid Is Bigger Than Expected, And Also a Giant Dead Comet Skull.

Last week, I wrote about a smallish asteroid that would be passing relatively close to -- but still well away from -- the Earth on Oct. 31. Hey, that's today! Yup: It'll pass us at 17:05 UTC, when it will be at closest approach, about 480,000 km (300,000 miles) away, farther than the Moon. As I mentioned in that earlier article, astronomers were planning on pinging it with radar pulses from the Goldstone radio telescope, and they also used the Arecibo radio 'scope in Puerto Rico. Those latter o...