It must have cleared all other celestial bodies, except its own moons, from its orbit.

On a small dwarf planet called Makemake, astronomers have seen signs of surprising temperature changes. These could indicate ...

Exoplanets can be quite different from Earth, but occasionally researchers find one that gives a sneak peak into what the ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

Therefore, the image of Jupiter circulating on social media was a real photograph taken by NASA's Juno spacecraft, but was ...

Fastest Known Planetary System May Have Been Pushed by Our Galaxy’s Supermassive Black Hole ...

The changing faces of Pluto| The predominant color of Pluto's surface is thought to result from ultraviolet radiation from the distant Sun breaking down methane on the planet's surface ...

These flares emit a great amount of X-rays and ultraviolet radiation. For a young red dwarf planet with an atmosphere, most ...

In 1995, astronomers confirmed the discovery for the first time of a brown dwarf, a body too small to be a star and too big to be a planet - sort of a celestial tweener. But it turns out that was ...

From afar, Pluto once seemed boring and dead. After all, the dwarf planet is only two-thirds the size of our moon and resides more than 30 times farther out from the sun than does Earth.

WASHINGTON, Oct 18 (Reuters) - In 1995, astronomers confirmed the discovery for the first time of a brown dwarf, a body too small to be a star and too big to be a planet - sort of a celestial tweener.