A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

In a thrilling development that challenges long-held assumptions about the outer reaches of our solar system, astronomers ...

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague?

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.” ...

Pam Engebretson/Physics Org The insight offered by the new study comes from studying maps of Pluto’s shape and features. The researchers discovered that cracks in its surface are of all ages ...

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 ...

Pluto Day 2023 is observed yearly on February 18 to mark the 1930 anniversary of Pluto’s discovery. Pluto was named after the Roman deity of the underworld and on the name of the founder of the ...

The diameter of Pluto, meanwhile, is 2,377 km. Further observations, potentially using radio telescopes, are needed to determine the object's exact size. Cheng discovered the object as part of an ...