How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.

The planets in order from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. If you include the ...

At a press conference, New Horizons' top dog Alan Stern just announced that his team has calculated Pluto's most accurate diameter yet: about 1,473 miles from one end to the other, give or take 12 ...

Today, NASA released the first ever close-up photographs of Pluto. The images showed icy mountains and a mysterious pale patch shaped like a heart. Judy Woodruff speaks to science correspondent ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

A new simulation of Pluto's upper atmosphere shows that it extends so far from the planet that stray molecules may be deposited on its largest moon, Charon.The new model predicts that Pluto's ...

Allow little Pluto to keep its planetary status and you would have to confer the same honor on Eris, a Kuiper Belt object of ...

Not until 1978 did astronomers detect its Texas-size moon Charon, about half the size of Pluto itself (even now no one is sure exactly how big Pluto is, but the estimated diameter is 1,430 miles ...

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there. By Jonathan O’Callaghan Some 4.5 billion years ...

Astronomers believe a planetary body collided with Pluto early in its history to create a gigantic heart-shaped feature on the dwarf planet. ... (700 kilometers) in diameter, ...