Rogue planet mass pinned down for the first time

Tokyo, Japan (SPX) Jan 06, 2026

Peking University, January 2, 2026: A coordinated observation campaign using space- and ground-based telescopes has yielded the first precise mass measurement of a rogue planet, confirming that one long-standing candidate is indeed a planet. Unlike planets in the Solar System, rogue planets travel through space without orbiting a host star.

Over the last decade, astronomers have identified