January 21, 2016 | Sheldon, Exhibitions Developer, Science Museum

Astronomers are claiming they've found another planet in our Solar System. They think it's about the same size as Neptune and might have a gas atmosphere.

The most fascinating thing about the discovery is that the planet has been predicted without actually being seen. The way some objects orbit the Sun can only be explained by the presence of another planet, beyond the eight we already know about.

This really shows us there's still much to learn about our stellar neighbourhood.

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Planet IX

The ninth planet would have a huge orbit - each rotation around the Sun could take about 15,000 years.

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Image: NASA JPL-Caltech Space Science Institute/Kevin M Gill

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