The Universe’s Baby Picture: Ancient Light from the Big Bang

What did the universe look like in its earliest days? Scientists can explore this mystery through the Cosmic Microwave Background (CMB), the oldest light we can observe. This ancient radiation was released about 380,000 years after the Big Bang, when the universe cooled enough for light to travel freely through space. Today, this faint glow reaches us from every direction, carrying a snapshot of the young universe. Tiny temperature variations within it reveal clues about how galaxies and large cosmic structures eventually formed. The CMB helps astronomers investigate the origins and evolution of our universe. #CosmicMicrowaveBackgroundBigBangEarlyUniverseAncientLightCosmologySpaceUniverseAstronomyNASASpaceFacts