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

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 ...

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.

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 ...

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

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

Choosing full cutoff fixtures and the appropriate amount of outdoor lighting is more important than the specific light source you use.

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