After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.

The astronomical linkup is fairly common and can happen at least every year depending on the number of planets.

New research may shine a light on part of outer space's great mysteries: the Oort Cloud. The Oort Cloud is the name given to ...

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

"It's like a game of billiards around the solar system, flying by a couple of planets at just the right angle and timing to ...

Seven planets will align in a rare planetary parade, offering a view of five planets visible to the naked eye in the night ...

Between February 25 and February 28, all seven planets in our solar system will be visible in the night sky. It's known as a ...

Filipinos witnessed a rare celestial spectacle on Friday, February 28, much like everyone else in the world. At the ...

The inner Oort cloud, between 1,000 and 10,000 AU from the sun, displays a spiral formation with arms that extend 15,000 AU.

planetary parades afford an uncommon opportunity to look up and appreciate our place in our solar system, with diverse worlds arrayed across the sky before our very eyes," NASA says on its website.

A parade of four or five planets visible to the naked eye happens every few years, according to NASA. A similar parade took place last June, but only two planets could be seen without any special ...

seven of the eight planets in our solar system will grace our sky. For much of the week, six of the planets may be visible, according to NASA. On Friday, however, Mercury will join the planetary ...