In December, look for Saturn’s iconic rings, and Mercury and Venus’s appearances. Eta Cassiopeiae, a double star, is visible with binoculars or a small telescope—look for its gold and blue hues. Finally, don’t miss the mid-December Geminid meteor shower, which boasts as many as 60 colorful meteors per hour.
“Tonight’s Sky” is produced by HubbleSite.org, online home of the Hubble Space Telescope. This is a recurring show, and you can find more episodes—and other astronomy videos—at http://hubblesite.org/videos/science