When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

Denton explained, “Pluto and Charon are smaller, colder, and primarily made of rock and ice. When we accounted for their material strength, we discovered something completely unexpected.” ...

In 1928, the amateur astronomer was offered a job at Lowell Observatory in Arizona, where he discovered Pluto. In 1934, he married Patricia Edson. They had two children, Annette and Alden.

Scientists have discovered a new type of planetary collision called “kiss-and-capture,” where Pluto and proto-Charon briefly ...

University of Arizona researchers have unveiled evidence of romance at the farthest reaches of the solar system: a cosmic ...

Now, new research suggests that Pluto and Charon briefly came together billions of years ago in a newly discovered “kiss and capture” collision. Scientists have long theorized that Charon ...

"Pluto and Charon are different—they're smaller, colder and made primarily of rock and ice. When we accounted for the actual strength of these materials, we discovered something completely ...

It was not until 1994 that the Hubble Space Telescope produced the first image of both Pluto and Charon with clear space between them. Christy's discovery was important because the existence of ...

Charon, its biggest of five moons, was discovered in 1978 by the U.S. Naval Observatory. At about 750 miles wide, it's half the size of Pluto — extremely large for a moon. In previous models ...

What’s unique about the separation is that Pluto and Charon still share the same orbit. This new discovery is helping researchers better understand how planets form and evolve, especially icy worlds.

FLAGSTAFF, ARIZ.? It’s been 75 years since the discovery of Pluto, but it remains a mystery. Pluto was quickly heralded as the ninth planet in the solar system when it was spotted Feb. 18 ...