Catch a delicate crescent moon from Sept. 23–27 and watch it pair with Spica, Mars and Antares in the west after sunset.

Watch the crescent moon, Venus and the bright star Regulus align in a rare predawn close conjunction tomorrow.

The Moon passes 5° north of Jupiter at 7 A.M. EDT. Early risers can enjoy the pairing before sunrise, standing some 50° high ...

The crescent moon will shine with Jupiter among the stars of Gemini early on Sept. 16. Turn your eyes to the east in the ...

In the early hours of September 16 skywatchers across North America and parts of Europe will have a rare opportunity to ...

Jupiter is the king of moons. With 95 of them orbiting the gas giant, some are so large they rival planets in size. But what would it actually be like to live on one of these moons? Let’s imagine ...

In a landmark observation by a team of international researchers, NASA's Juno spacecraft has, for the first time, clearly detected the auroras of Jupiter's moon Callisto. This discovery completes the ...

The autumn night sky in Ireland is an observer's treasure-trove and the first celestial event of the season arrives on September 7 with a lunar eclipse and blood moon ...

Io, Europa and Ganymede had already shown their footprints through earlier observations. But Callisto, the farthest Galilean ...

At 7 A.M. EDT, the Moon is observed 5° north of Venus, positioned between Venus and Pollux (magnitude 1.2). Pollux, despite being cataloged as Beta Geminorum, exhibits a slightly higher brightness ...

The Three-Body Problem isn't just the name of a viral Netflix series or a Hugo Award-winning sci-fi book. It also represents a real problem in astrodynamics—and one that can cause headaches for ...