Exoplanet improves the chance of an unknown Solar System planet
May 12, 2021
2 minutes
Editor: Jens E. Matthiesen
![f0010-01](https://article-imgs.scribdassets.com/86s3sjrvk08nzfjb/images/fileCAJK2P2M.jpg)
STRONOMY For decades, astronomers have been searching for an unknown planet in our Solar System: Planet 9. According to the theory, it is located 13-26 times further away from the Sun than the outermost known planet, Neptune. Planet 9 has never been observed, but the orbits of six small worlds on the outskirts
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