Five-planet Nice model distant massive ninth planet is responsible for the alignment of the perihelia of several trans-Neptunian objects with semi-major axes greater than 250 AU. Although the mechanism for the ejection of the fifth giant planet in the five-planet Nice model is reminiscent of the origin of Planet Nine, with a gravitational instability including an encounter with Jupiter, it is unlikely to be the same planet. The estimated timing of the capture of Planet Nine onto its distant orbit, three to ten million years after the formation of the Solar System, when the Sun was still in its birth cluster, is inconsistent
Tales from the Planet Earth Tales from the Planet Earth Tales from the Planet Earth is a 1986 anthology of science fiction stories edited by Frederik Pohl and Elizabeth Anne Hull It presents 18 stories, sharing a common background developed by Pohl and Hull, by 18 authors from 18 different countries; each author's story is set in his native country. The collection was dedicated for the memory of A. Bertram Chandler and Janusz A. Zajdel. Orson Scott Card described the anthology as "a world tour of science fiction" and reported "it will make you more appreciative of the best of America sf -- and more