Cosmic microwave background reveals gas flows in galaxy clusters

Astrophysicists used the cosmic microwave background (CMB) to detect gas flowing within galaxy clusters. Mapping fluctuations in the ancient light, emitted about 380,000 years after the Big Bang, helps estimate the universe's age and composition.

• The CMB dates back to roughly 380,000 years after the Big Bang
• CMB fluctuations help estimate the universe's age and composition
• CMB data revealed gas motion inside galaxy clusters