Forget Planet 9—there's Evidence of a Tenth Planet Lurking at the Edge of the Solar System Published Jun 23, 2017 at 10:43 AM EDT Artist impression of "Planet 10".

The planet, circled in white, moves across a background of stars Astronomers have found a tenth planet, ... Tenth planet discovered in outer solar system. By Jeff Hecht. 30 July 2005 ...

New Evidence Suggests That Our Solar System Has 10 Planets The planet could be about the size of Mars and much closer than Planet Nine. / Hard Science / Kuiper Belt / Solar System / Tenth Planet ...

Astronomers in the United States have announced the discovery of the "10th planet" to orbit our Sun. The largest object found in our Solar System since Neptune in 1846, it was first seen in 2003 - but ...

Near-infrared spectra show signs of methane ice on the planet's surface, indicating that it has not been warmed significantly since the birth of the solar system some 4.5 billion years ago.

This hypothetical planet was dubbed "Planet Nine," so if both predictions are correct, one of these putative objects could be the solar system's 10th planet. You may like ...

The so-called 10th planet, an object larger than Pluto that ranks as the most distant body known in the solar system, has a moon.

Astronomers have discovered an object in our solar system that is larger than Pluto. They are calling it the 10th planet, but already that claim is contested. The new world's size is not at issue ...

THE dark outer reaches of our solar system could be hiding a new planet – the ninth or tenth, depending on who’s counting. The as-yet-unconfirmed world, thought to be around the mass of Mars ...

LOS ANGELES -- Astronomers announced Friday that they have discovered a new planet larger than Pluto in orbit around the sun. The discovery in the outlying regions of solar system was made with ...

All eight of the solar system’s “major” planets appear in this illustration, ... Should it be discovered, whether you want to call it the ninth or 10th or 1,000th planet is up to you.