The Moon passes 5° north of Venus at 9 A.M. EDT, although neither is visible then. Instead, you can view them together in the evening sky. Some 40 minutes after sunset, the first bright stars are ...

Amateur astronomers dubbed this object M110 in the 1960s, so we choose not to include it. Charles Messier’s list stops at 103 objects. Historically, that should be the last word, but it would be hard ...

The bestselling author discusses his inspiration, creative process, and favorite scientific tidbits behind the feature film.

High in the south this evening is Canis Minor the Little Dog, shining above the bright star Sirius, which lies closer to the horizon. True to its name, the Little Dog is a little constellation, ...

The distant ice giant Uranus is located in Taurus right now, not far from the famous (and easy-to-find) Pleiades star cluster, cataloged as M45. Tonight, the planet also sits a short distance due ...

A transit of Io and its shadow occurs early this morning, after which Io reaches the western extent of its orbit and comes back around, passing behind Jupiter in an occultation visible late tonight.

Look north this evening a couple hours after sunset and you’ll easily spot the large shape of the Big Dipper as it sits upside-down in the sky, appearing to pour from its cup into that of the smaller ...

Look north this evening for Ursa Major the Great Bear, whose back half is best known as the Big Dipper. The two stars on the far end of the cup from the handle are called the Pointer Stars: These are ...

The Sun, along with more than 1,500 other stars, journeyed from the middle of the Milky Way to its current position a few billion years ago.

The Galilean moon Callisto disappears behind Jupiter in an occultation early this morning. The catch is that the event is only visible from the western half of the U.S., but observers farther east can ...

From Mars, Earth transits the Sun four times in a 284-year cycle. The transits occur in either May or November at intervals of 100.5, 79, 25.5, and 79 years. During these events, Earth and the Moon ...