In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

Astronomers discover GJ 2126 b, a giant planet with an extremely eccentric orbit, 124 light-years away, using HARPS data.

Fresh results from near-infrared instruments foretell a bright future for finding life elsewhere in the Milky Way ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

With a diameter of 1,440 miles, Pluto is farthest from the sun. While major planets make roughly circular orbits, Pluto ...

NASA's Dr David Grinspoon claims there could be life on the dwarf planet Ceres as astrobiologists are constantly 'surprised' ...

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles. Don't miss out on what's happening! Stay in touch with breaking news, as it happens, conveniently in your email inbox.

Radioactive decay produced a warm internal ocean Dwarf planet Ceres, the unpleasant lump of icy rock orbiting between Mars ...

The life cycles of stars are fascinating, and sometimes the line between stars and planets isn’t as clear as it […] ...

On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

In 2006, and after much debate, the International Astronomical Union came up with a new definition for a planet. And for the first time, the term "dwarf planet" was used. Dwarf Planets ...