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:
   / @sciencechannel  

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:   / sciencechannel  
Twitter:   / sciencechannel  
Instagram:   / sciencechannel  
TikTok:   / sciencechannel