A mysterious ninth planet lurks in the outer reaches of our solar system and it’s a giant: ten times the mass of the Earth. But why is it so hard to catch a glimpse of? #ScienceChannel #HowTheUniverseWorks About How the Universe Works: With a cast of experts and eye-popping CGI, we're looking under the celestial hood to tell the greatest story of all -- the story of where we and everything else came from. Subscribe to Science Channel: null About Science Channel: Learn about outer space, leading scientific exploration, new technology, earth science basics, & more with science videos & news from Science Channel. Find us on social: Facebook: https://www.facebook.com/ScienceChannel/ Twitter: https://twitter.com/sciencechannel Instagram: https://instagram.com/sciencechannel TikTok: https://tiktok.com/@sciencechannel