4 ms·
It's estimated to have 10 times the mass of earth, putting it up in the Uranus and Neptune range: https://en.wikipedia.org/wiki/Planet_Nine#Size_and_composition
by flukus 8y ago
It's estimated to have 10 times the mass of earth, putting it up in the Uranus and Neptune range: https://en.wikipedia.org/wiki/Planet_Nine#Size_and_composition https://en.wikipedia.org/wiki/Planet_Nine#Size_and_compositi... .
- ajmurmann 8y agoSize isn't sufficient though. It also needs to have cleared its orbit.
- flukus 8y agoIt's orbit is thought to range between 200 and 700 AU, which is well outside the Kuiper belt at 30-50 AU and well inside the Oort cloud at 2,000-200,000 AU. So barring the discovery of more stuff in that area it seems to qualify.
- skykooler 8y agoWould that explain why there's a gap between the outside of the Kuiper Belt and the inside of the Oort Cloud?
- flukus 8y agoThat would be well beyond my knowledge or ability to say. It certainly seems plausible, it may even explain the existence of the Kuiper belt, being held in the balance between Neptune and this planet much like the inner belt is by Mars and Jupiter.