PASADENA, Calif.–The International Astronomical Union (IAU) today downgraded the status of Pluto to that of a “dwarf planet,” a designation that will also be applied to the spherical body discovered ...

LOS ANGELES – A distant, icy rock whose discovery shook up the solar system and led to Pluto's planetary demise has been given a name: Eris. The christening of Eris, named after the Greek goddess of ...

PASADENA, Calif.–To paraphrase a certain young lady from literature, the tenth planet Xena is getting curiouser and curiouser. Data released today by the Space Telescope Science Institute reveals that ...

The dwarf planet formerly known as Xena received a new name Thursday, while Pluto was given a number to reflect the loss of its status as a planet. Michael Brown, a professor of planetary astronomy at ...

NASA's Hubble Space Telescope has resolved the "tenth planet," nicknamed "Xena," for the first time and has found that it is only just a little larger than Pluto. Though previous ground-based ...