Glossary · Celestial objects
Galaxy
A vast system of stars, gas, dust and dark matter bound by gravity. Our galaxy, the Milky Way, contains about 200 billion stars. Telescopes like Hubble and Webb observe distant galaxies to understand the evolution of the universe.
Definition
A vast system of stars, gas, dust and dark matter bound by gravity. Our galaxy, the Milky Way, contains about 200 billion stars. Telescopes like Hubble and Webb observe distant galaxies to understand the evolution of the universe.