groupsofgalaxies
nounUK /ɡruːps əv ˈɡæləksiz/
US /ɡruːps əv ˈɡæləksiz/
Groups of galaxies are bunches of many galaxies that stay close together in space.
Scientists study groups of galaxies to learn how the universe is put together.
OTHER MEANINGS
2. Large collections of galaxies held together by gravity, often containing dozens of members.
Our Milky Way belongs to a small group of galaxies called the Local Group.
3. In astronomy, systems where galaxies orbit and interact with one another.
Groups of galaxies can pull on each other and even merge over time.
4. Clusters of galaxies used as markers to map the structure of the universe.
By mapping groups of galaxies, astronomers can see huge cosmic webs.