Science ❯ Astronomy

Orbital Dynamics

Quasi-Satellites Eccentric Orbit Sednoids NEOs Geostationary Orbits Satellite Drift Gravitational Interactions Orbital Evolution Gravitational Influence High-Eccentricity Migration Transit Timing Variations Space Debris Lunar Standstill Asteroid Tracking Lunar Cycles Earth's Orbit Space Weather N-Body Simulations Ecliptic Plane

The Moon Is Drifting Farther From Earth by 3.8 Centimeters a Year

Tidal forces slowly push the Moon outward, lengthening Earth's day over deep time.

Discovery of 'Ammonite' Narrows Search for Planet Nine

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

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