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.

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 ...

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

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 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 ...

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

The 192nd asteroid discovered in the main belt is now at its best, located within a diamond shape of brighter field stars.