Science ❯ Physics ❯ Astrophysics

Celestial Mechanics

Orbital Dynamics Trajectory Analysis Comet Behavior Radial Velocity Measurements Earth's Rotation Dynamics Cometary Dynamics Gravitational Interactions 3I/ATLAS Interstellar Objects Gravity Assists

Discarded SpaceX Falcon 9 Stage Set to Strike Moon in Rare, Predictable Impact

Planned observations will measure the ejecta plume and crater to test impact models and inform rules for disposing rocket hardware near the Moon.

Lucy Finds Tumbling Asteroid with Water-Altered Clay

Hubble Accidentally Captures Comet C/2025 K1 Splitting Into Multiple Fragments

Hubble Accidentally Captures Comet C/2025 K1 Breaking Into Pieces in Rare Real-Time View

Late-Blooming Rocky World, JWST Chemistry Recast Planet Formation

Geminids Peak This Weekend With Favorable Skies and Two Nights of Viewing

Interstellar Visitor 3I/ATLAS Emerges Intact With HiRISE Images Expected Within Days

3I/ATLAS Passes Perihelion as Spacecraft Step In to Observe the Interstellar Comet

Viral Mars Rover Image of 3I/ATLAS Draws Fresh Scrutiny as Scientists Flag Camera Artifact

Single Underground Ring Laser Tracks Earth’s Axis Wobble With Unprecedented Precision

ESA's Juice Restores Communications Ahead of Aug. 31 Venus Flyby

Japan’s ispace Resilience Lander Achieves Lunar Orbit Ahead of June Landing Attempt

New Theory Proposes Mars' Moons Formed from Shredded Asteroid