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BellaOnline's Astronomy Editor

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Outer Solar System

The Trans-Neptunian objects (TNOs) are here. The region includes the Kuiper Belt, scattered disk and the Oort Cloud. The best known objects are Pluto and its moons, but there are comets too.

Comets star
Ill omens, objects of fascination, bringers of life, key to the ancient history of the Solar System. Comets are all of these things. Find out more about these small Solar System bodies.

Kuiper Belt - Facts for Kids star
Plutoīs not the last planet, itīs the first Kuiper Belt Object. The Kuiper Belt is made up of millions of icy bits left over from the beginning of the Solar System. It starts at 30 AU - thatīs 30 times farther from the Sun than the Earth. From there it stretches for another 2 billion miles!

Pluto star
NASA's New Horizons is on its way to visit Pluto, but it has a long way to go yet. Meanwhile here's a profile of dwarf planet 134340 Pluto, largest object in the Kuiper Belt and former planet. It has a lot of titles for something so small.

Pluto Is a Dwarf Planet star
A lot of people were upset when Pluto stopped being a planet. Some still are. But was it ever really a planet?

The Kuiper Belt star
Pluto was once the last outpost of the Solar System. Now we realize that it's the gateway to the Kuiper Belt, a disk made up of rubble left over from the formation of the Solar System. The Kuiper Belt is big and it's cold and the Sun would just look like a bright star from there.

Whatīs in a Name star
Things arenīt always what they seem. Many discoveries arenīt named for – or by – their discoverers. Halley didnīt discover Comet Halley. Kuiper said the Kuiper Belt didnīt exist. The Herschels called Uranus "the Georgian planet" after George III of England, but no one else did.

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