Wikipedia:Today's featured article/requests/Planet Nine

Planet Nine

 * This is the archived discussion of the TFAR nomination for the article below. Subsequent comments should be made on the appropriate discussion page (such as Wikipedia talk:Today's featured article/requests). Please do not modify this page.

The result was: scheduled for Today's featured article/April 9, 2019 by Jimfbleak - talk to me?  15:00, 5 March 2019 (UTC)



Planet Nine is a hypothetical planet in the outer region of the Solar System. Its gravitational effects could explain the unlikely clustering of orbits for a group of extreme trans-Neptunian objects, bodies with average distances from the Sun that are more than 250 times that of Earth. These objects tend to make their closest approaches to the Sun in one sector, and their orbits are similarly tilted. These improbable alignments suggest that an undiscovered planet may be shepherding the orbits of the most distant known Solar System objects. Planet Nine would have a predicted mass five to ten times that of Earth, and an elongated orbit extending 400 to 800 times as far from the Sun as the Earth's. It may have been ejected from its original orbit by Jupiter during the genesis of the Solar System, wrested from another star, captured as a rogue planet, or pulled into an eccentric orbit by a passing star.
 * Most recent similar article(s): I don't think we've run any Solar System planets recently.
 * Main editors:, , , ,
 * Promoted: Feb 28, 2019
 * Reasons for nomination: It has 57 equivalent articles in other language versions of Wikipedia, and is listed as a Top Importance Astronomy article.
 * Support as nominator. Jehochman Talk 16:33, 1 March 2019 (UTC)