Astronomers have discovered their most compelling evidence yet that there's a mysterious 9th planet in our solar system

Astronomers have new evidence that seems to confirm Planet 9’s existence.

Produced by Emmanuel Ocbazghi. Original reporting by Jess Orwig.

Follow BI Video: On Twitter 

Business Insider Emails & Alerts

Site highlights each day to your inbox.

Follow Business Insider Australia on Facebook, Twitter, LinkedIn, and Instagram.