Scientists have discovered a mysterious ninth planet ten times the size of Earth on the very edge of the solar system; this strange world could have moons with extraterrestrial life. <br /><br />Thanks for watching. Follow for more videos. <br />#cosmosspacescience <br />#howtheuniverseworks <br />#solarsystem <br />#cosmology <br />#astronomy <br />#space <br />#time <br />#planet9 <br />#episode2 <br />#season5 <br />#mysteryofplanet9 <br />
