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

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

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

Hubble Space Telescope observations of white dwarf star G238-44 has shown that it is "consuming both rocky-metallic and icy ...

A team of astronomers has uncovered an Earth-like planet orbiting a star located 4,000 light years away from the solar system ...

Astronomers have discovered an Earth-like planet orbiting a white dwarf 4,000 light years away, raising questions about Earth ...

Astronomers have been curious about the makeup of Ceres, the largest object in the asteroid belt, ever since its discovery by ...

A distant white dwarf hosts an Earth-like planet in an orbit that might be similar to Earth’s if it survives the Sun’s red giant phase.

It's thought to be a dwarf planet nicknamed FarFarOut. This is the most distant object yet seen in our solar system by some of our most powerful telescopes. But it's not the limit of what could be ...

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

Within GRAVITY’s combined observations, Xuan’s team discovered that Gliese 229 B was not a single object, but a pair of brown ...

These stars are the most common type in the universe. One nearby M-dwarf, TRAPPIST-1, is about 40 light-years away and has a system of planets that are being closely studied for their potential to ...