The Geminid meteor shower—considered by many to be the most active annual sky show—is going to be especially spectacular this year, astronomers predict. The show gets its name from the constellation Gemini, because the meteors appear to stream from near the constellation's bright star Castor. Unlike last year, the Geminids will be falling against a dark, moonless night. The last time the sky was this dark during the shower was in 1996, when observers saw up to 110 meteors an hour. Experts say the rate will be at least that high this year, with peak viewing on December 13 and...