The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Eris is three times more distant than Pluto. And its relationship to Pluto — a world demoted since 2006 from the solar system’s ninth planet to a lowly dwarf planet, in large part due to the ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

The theory could explain how the dwarf planet (yeah, we wish Pluto was still ... have torqued Charon into a close, higher circular orbit from which the moon would have migrated outward.

The dwarf planet is a bizarre, cryovolcanic world. However, the organic deposits discovered on its surface so far are unlikely to originate from its interior. The organic material found in a few ...

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

the researchers looked for previously unknown deposits of organic material on dwarf planet Ceres. With its location in the middle of the asteroid belt between the orbits of Mars and Jupiter, the body ...

The organic material on the dwarf planet Ceres is probably of extra-Ceresian origin: a recent study concludes that asteroids from the outer asteroid belt that crashed into the dwarf planet brought ...

The aptly named Dwarf 3 will make you think again ... This isn’t a great telescope for shooting planets – even the moon and sun (solar filters are supplied) don’t exactly fill the frame.