Uploaded February 2016 | Updated September 2026, 3 weeks ago

---

Evidence suggests that a ninth large planet might be lurking well beyond Pluto. Discussed here by Professor Mike Merrifield, an astronomer at the University of Nottingham.
Read the paper about it: bit.ly/planet_nine

Deep Sky Videos: youtube.com/DeepSkyVideos
Objectivity: youtube.com/c/objectivityvideos

Visit our website at sixtysymbols.com
We're on Facebook at facebook.com/sixtysymbols
And Twitter at twitter.com/sixtysymbols
This project features scientists from The University of Nottingham
bit.ly/NottsPhysics

Sixty Symbols videos by Brady Haran
bradyharanblog.com

Email list: eepurl.com/YdjL9