Science ❯ Astronomy ❯ Celestial Bodies

Dwarf Planets

Pluto Ceres 2017 OF201 Trans-Neptunian Objects Sedna

NASA Chief Backs Push to Restore Pluto’s Planet Status

The pledge signals an institutional effort to reopen the question under rules set by the astronomers’ union.

NASA Chief Responds to 10-Year-Old’s Pluto Plea With “We Are Looking Into This”

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

William Shatner and Elon Musk Rally for Pluto's Planetary Comeback

Astronomers Identify Prime Candidate for Hypothetical Planet Nine

New 'Kiss and Capture' Theory Explains Pluto and Charon's Formation

Pluto and Charon's Formation Explained by 'Kiss and Capture' Collision

Ancient Stellar Flyby Reshaped Outer Solar System's Orbits