The WMAP Mission: A Complete Guide to Cosmic Microwaves NASA’s Wilkinson Microwave Anisotropy Probe (WMAP) transformed cosmology from a game of theoretical guesswork into a precise science. Launched on June 30, 2001, the space observatory spent over nine years measuring the thermal afterglow of the Big Bang—known as the Cosmic Microwave Background (CMB). By creating an ultra-precise, all-sky map of these ancient microwaves, WMAP pinpointed the age, composition, and definitive geometry of our universe. What is the Cosmic Microwave Background?
The Cosmic Microwave Background is the oldest light in the cosmos, released approximately 375,000 years after the Big Bang. During this early epoch, the infant universe cooled down enough for protons and electrons to bond into neutral hydrogen atoms. WMAP Overview – NASA Science
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