Extragalactic globular clusters millions of light-years away are hiding in your astroimages. Here’s how to find them.

The waning Moon passes through Cancer, sharing the constellation with both Mars and the Beehive Cluster (M44).

Proposals are submitted annually by scientists who wish to use these facilities, and are reviewed by the Telescope Allocation Committee.

Astronomers meeting in Prague have decided by a wide margin that Pluto no longer merits consideration as a full-fledged planet. The historic decision follows a week of sometimes contentious debate ...

The ringed planet is now at its best for the year, reaching opposition in the constellation Cetus and shining all night.

Saturn reaches opposition this month, Neptune lingers near Saturn, Mars transits the Beehive, and Jupiter is occulted by the ...

Size: Venus is about 7,521 miles (12,104 kilometers) in diameter. Distance from the Sun: The second planet from our star has an average distance from the Sun of 67 million miles (108 million km).

A crescent Moon passing in front of our solar system’s largest planet is a rare and brilliant sight. Here's how to see it for ...

The ringed planet reaches opposition and the Moon occults Jupiter in a rare event not to be missed in the sky this week.

The small saturnian moon Dione passes in front of the ringed planet, bringing its tiny shadow along for the journey.

Planet Venus comes to a halt against the background stars; catch it shortly after sunset along with Mercury, before the pair ...

Jupiter’s largest moon, Ganymede, transits the gas giant’s disk this morning. Some part of the event, which lasts more than ...