Day 356 of 365
December 22
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Space Cosmic Microwave Background
The Cosmic Microwave Background (CMB) is light from 380,000 years after the Big Bang - the oldest observable thing. Its tiny temperature variations show matter density that seeded galaxy formation. The CMB confirms Big Bang cosmology and reveals the universe's age and composition.
💡 Did you know?
About 1% of TV static is caused by the Cosmic Microwave Background!
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