The outer solar system has some ice and rocks orbiting so far from the sun that it’s hard to imagine how they got there – but an ancient rogue planet may hold the key
October 1, 2022
A rogue planet twice the size of Earth may have pushed asteroids into the outer reaches of the early solar system before being ejected. This could solve the mystery of how some of the most distant objects in the Kuiper Belt got there, which most models of solar system formation cannot explain.
Kuiper belt It is a huge disk of icy rock that extends beyond the orbit of Neptune. …