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

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

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

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 ...

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).

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 ...

The solar system’s most distant planet is now at opposition and looking its best. Search it out after dark using optical aid.

Scientists once thought luminiferous ether pervaded the cosmos. Michelson and Morley’s ingenious experiment to find it ...

Tonight’s a two-for-one deal as the Double Cluster shines in Perseus’ northwestern corner, ready for wide-field or closeup ...