Transcription
Scientists are now saying that there may be a ninth planet out beyond the orbit of Neptune.
Question: What is the deal?
>> The deal is that it's first, it's not Pluto, [music] just to make that clear. It's not just a little bit beyond Neptune or Pluto. It's like 50 times farther away. So, [music] we want to call it Planet Nine and make it all part of the family, but this thing is so far away that it has yet to complete an orbit around [music] the sun since the ice age.
>> And we haven't seen it yet.
>> No, no, no, no. It's very far out there and we know the way to figure it out is you look at the rest of the stuff that's orbiting out there. You say, you know, this collecting over here when it should be over there. There must be some unseen force of gravity enabling that. And so, you back calculate the equations and you say, "There's got to be an object 10 times the mass of the Earth over there to make that happen."