The Search for Planet X
Learn more about the search for Planet X, a.k.a our true ninth planet.
A couple notes on the video:
– Some astronomers refer to Planet X as ‘Planet Nine’.
– Sedna is no longer the farthest object seen in the Solar System—but was when it was discovered in 2003.
More Thought Café + videos: http://bit.ly/1KpGB0s
In collaboration with Popular Science: http://www.popsci.com/