Endless Facts, One Snippet at a Time
Galaxy Clusters: The Largest Structures in the Universe
- Galaxy clusters are massive groups of hundreds to thousands of galaxies bound by gravity.
- They are the largest gravitationally bound structures in the universe.
- A typical cluster spans millions of light-years across.
- Clusters contain not only galaxies but also vast amounts of hot X-ray–emitting gas.
- Dark matter makes up most of a cluster’s total mass, holding it together.
- Famous examples include the Virgo Cluster and the Coma Cluster.
- Clusters often merge, releasing enormous energy and reshaping cosmic structure.
- Gravitational lensing in clusters can magnify and reveal distant galaxies.
- Studying clusters helps trace the influence of dark matter and dark energy.
- Galaxy clusters form the building blocks of the cosmic web—the universe’s grand design.