On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...

"Pale Blue Dot" – one of the last photos taken by Voyager 1 – is still the most distant image of the Earth. Astronomer Carl ...

A comical planetary beauty contest is described, highlighting the unique traits of each planet: Mercury’s fiery nature, Venus ...

Astronomers have discovered what seems to be a star racing through the Milky Way at 1.2 million mph, dragging a Neptune-sized planet along for the ride.

Each planet in our solar system is given a unique, humorous catchphrase that reflects its personality and role. From ...

If the solar system held a poetry slam, each planet would present its unique poetic style. Mercury delivers rapid-fire verses ...

This artist's concept visualizes a super-Neptune ... or planets outside our solar system. Microlensing occurs because the ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...