A gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. Galaxies range from dwarfs with billions of stars to giants with trillions. The Milky Way contains an estimated 100-400 billion stars.
The barred spiral galaxy containing our solar system, with an estimated 100-400 billion stars spanning about 100,000 lig...
A hypothetical form of matter that does not emit, absorb, or reflect light. Its existence is inferred from gravitational...
A massive, luminous sphere of hot gas held together by gravity, generating energy through nuclear fusion. Stars range fr...
Dive deeper into galaxy and related concepts on Cosmos Observatory.