Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short life of what was, for a single human lifetime, the solar system's ...

Online chatter and a frenzy of media coverage has tended to make a big deal of allegedly rare "planetary alignments" and "planet parades" gracing our night skies. The hoopla has culminated this ...

A new habitable planet that orbits a sun-like star been discovered by scientists. The exoplanet, a planet outside our solar system, was originally discovered two years ago by Oxford University ...

Pluto was discovered at Lowell Observatory in Flagstaff, Arizona in 1930 and was considered our ninth planet until 2006. The International Astronomical Union reclassified Pluto as a dwarf planet ...

With family wealth to back him, he founded an observatory in the western dark-sky desert of the U.S. and hoped to unlock the mystery of the Red Planet. He soon became fascinated by another cosmic ...

On any given night, weather permitting, you can spot at least one bright planet in the sky, and lineups of four or five planets, seen by the naked eye, typically occur every few years, according ...

On Feb. 28, a stellar alignment of planets will illuminate the night sky for the last time in a decade Space Frontiers/Hulton Archive/Getty Calling all stargazers and astronomy enthusiasts ...

Most are expected to be visible to the naked eye, though not all seven. The alignment is known as a planet parade — a planetary lineup in space from Earth’s perspective. The alignment takes ...

Around the end of the month, Saturn will slip below the horizon and into daytime skies, ending the seven-planet parade. But stargazers will get another chance to see a planetary alignment in ...

Get all the news you need in your inbox each morning. Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short life of what was ...