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Planet 9

Gray rocks appear against a dark sky, with a bright star in the background.
Posted inNews

A Survey of the Kuiper Belt Hints at an Unseen Planet

Katherine Kornei, Science Writer by Katherine Kornei 16 September 202516 September 2025

An analysis of more than 150 objects in the far reaches of the solar system suggests that a planet more massive than Mercury could be lurking beyond the orbit of Pluto.

This illustration depicts a planet with blue clouds with several lightning storms. The Sun is faint in the distance. The band of the Milky Way and small pinpoints of stars fill the background.
Posted inNews

A Mission to Uranus Could Help Find Planet 9

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 22 May 202322 May 2023

Narrowing down the search is essential for gaining time on a high-powered telescope that could spot the hypothesized planet directly.

An image of Pluto captured by NASA’s New Horizons probe.
Posted inNews

Six Things Dwarf Planets Have Taught Us About the Solar System

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 17 August 201611 September 2025

It's been 10 years since Pluto was reclassified as a dwarf planet. But no matter the label, it and its dwarf planet cousins continue to stun researchers with their complexity.

Posted inNews

Proposed Planet Nine Elicits Cheers, Yawns, Hunt for Proof

by R. Cowen 4 February 201611 September 2025

Evidence of a large, unseen planet at the solar system's margins prompted a flurry of scientific paper downloads, as well as oodles of skepticism. There's no sighting yet of the purported body.

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