Science ❯ Astronomy ❯ Galaxies

Galactic Dynamics

Gravitational Forces Stephan's Quintet Doppler Shift Milky Way and Andromeda Collision Small Magellanic Cloud Black Hole Systems Stellar Migration Galactic Collision Stellar Movement

Astronomers Pinpoint the Milky Way’s Star-Forming Edge at About 35,000–40,000 Light-Years

Ages of more than 100,000 giant stars trace a sharp cutoff in star birth across the disk.