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.
Planet 9
Posted inNews
A Mission to Uranus Could Help Find Planet 9
Narrowing down the search is essential for gaining time on a high-powered telescope that could spot the hypothesized planet directly.
Posted inNews
Six Things Dwarf Planets Have Taught Us About the Solar System
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
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.