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Planned outage -- MAST Services will be unavailable Tuesday 16 January 2018, 09:00 to 17:00 EST (14:00 to 22:00 GMT) for system upgrades. We apologize for the inconvenience.

Image of COBE

Cosmic Background Explorer has provided strong evidence supporting the Big Bang, the explosion believed to have given birth to the Universe.

Cosmic Background Explorer, NASA.