Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

Scientists have discovered that at least seven Earth-sized worlds circle the star TRAPPIST-1, a ultracool dwarf ... the planets surrounding it would all be within the orbit of Mercury, according ...

One of these dwarf planets actually orbits in between ... Pluto is unique. While its orbit is elliptical like all the others, it is the only planet that sometimes crosses inside the orbit of ...

But almost all of these icy worlds are painfully ... the dwarf planet will be just outside the orbit of Haumea, another dwarf planet in Pluto's part of space, which is a region known as the ...

What might your home be like if it were in red dwarf orbit? The answer is kind ... would appear black. In fact, all the life on our imaginary planet might not just look different because of ...

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

The Sun’s gravity holds all of ... more dwarf planets were discovered and it was reclassified. There are many comets in the outer solar system. Comets are icy objects, which orbit the sun ...

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...