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Héctor Socas-Navarro, Investigador científico en astrofísica. Director del Museo de la Ciencia y el Cosmos de Tenerife, Instituto de Astrofísica de Canarias

There could still be a ninth planet in our Solar System – here’s why

Solar System Neptune Pluto Earth
Artist's rendering of Planet 9 with an icy surface. Image generated by the authors with the help of GPT-3. Author provided

We all used to think there were nine planets. But in 2006 the solar system was left with only eight planets, when Pluto was no longer classified as such. Is it still possible there is a planet out there beyond Neptune – possibly way beyond it?

In the last 20 years, we have made significant strides in exploring the outer solar system.

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