A Galaxy is a gravitationally bound system of stars, gas, dust, dark matter, and often a central black hole.

Our [[Sun]] lives in the Milky Way, which is just one galaxy among a ridiculous number in the observable [[Cosmos]].

Galaxies form, merge, and evolve over cosmic time, and their heavy elements are constantly replenished by events like [[Supernova|supernovae]].

## See also
- [[Star]]
- [[Supernova]]
- [[Black Hole]]
- [[Cosmos]]