Science ❯ Astronomy ❯ Celestial Bodies

Dwarf Planets

Pluto Ceres 2017 OF201 IAU Definitions Eris Plutinos Trans-Neptunian Objects Sedna

NASA Chief Backs Restoring Pluto’s Planet Status, Plans Scientific Push

The move tests NASA’s influence on a decision only the IAU can make.

Six-Planet Parade Continues as Mercury Rises and Moon Approaches

New Distant Sednoid ‘Ammonite’ Casts Doubt on Planet Nine Hypothesis

New Dwarf Planet Discovery Challenges Planet Nine Despite 40% Simulated Odds