Welcome to May, our last full month of spring. Nights are getting shorter — by the end of the month, the sun will set just before 9 p.m., and full darkness will not happen until after 11 p.m. But even those twilight evening hours provide plenty to see.

What's In the Sky, by Jim White

Comet ISON, first spotted by Russian astronomers in September 2012, broke up while passing too near the sun this Thanksgiving. After billions of years of traveling through space, it now consists of little more than scattered dust and rocky debris.