"No Earth impact is possible, " according to Don Yeomans, manager of the Near-Earth Object Program Office at NASA's Jet Propulsion Laboratory.

CNN: Russian meteor shower causes blast; hundreds injured

It's hard to predict exactly how bright Pan-STARRS will be, but you should be able to see it without binoculars or telescopes, said Don Yeomans of NASA's Near-Earth Object Program.

CNN: Welcome to the year of the comet (we hope)