Our Universe & a Ninth Planet

“Astronomers at the California Institute of Technology announced Wednesday that they have found new evidence of a giant icy planet lurking in the darkness of our solar system far beyond the orbit of Pluto. They are calling it ‘Planet Nine.'” 

This is so fascinating to me! It’s just there? And we didn’t know! More here: New evidence suggests a ninth planet lurking at the edge of the solar system (WaPo)