adjective
- Located or occurring outside our galaxy (the Milky Way); relating to objects or phenomena beyond the boundaries of our own galaxy.
Usage: astronomy; technical
Examples
- Astronomers discovered an extragalactic supernova in a distant galaxy.
- The Andromeda Galaxy is the nearest extragalactic object visible to the naked eye.
- Extragalactic surveys have revealed millions of galaxies beyond the Milky Way.
- The telescope was designed to study extragalactic phenomena and distant star systems.
- Extragalactic sources of radiation help scientists understand the universe's structure.