Close to 18 years ago, astronomers spotted a miniature, icy world named Eris billions of miles beyond Neptune. But unlike its dwarf planet cousin Pluto — which New Horizons promoted to a rich ...

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

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

is a disc-shaped region beyond the orbit of Neptune’s in the outer solar system—50 Earth-sun distances—that’s home to dwarf planets like Pluto, Makemake and Eris. It’s also thought to be ...

Famously, Pluto no longer met the criteria and was demoted to a dwarf planet. Things have been a ... when astronomer Mike Brown discovered Eris, an object about the same size as Pluto orbiting ...

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

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

A dwarf planet thought to have some ice mixed in with its dirty surface may have a lot more cool than we ever expected. Ceres – the largest body in the asteroid belt between Mars and Jupiter – could ...

Famously, Pluto no longer met the criteria and was demoted to a dwarf planet. Things have been a bit of a mess since ... when astronomer Mike Brown discovered Eris, an object about the same size as ...