WMAP (Wilkinson Microwave Anisotropy Probe)

This illustration shows NASA’s WMAP spacecraft in shades of blues. The bottom of the satellite is a round circle, like a ballerina’s tutu. Rising from the circle is a bulky, vaguely cylindrical shape topped by two circles facing opposite directions.
December 20, 2022
Historical DateDecember 20, 2022
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An illustration of NASA’s WMAP spacecraft. The colors depicted in this illustration are for artistic purposes only.

WMAP measured temperature differences across the sky in the cosmic microwave background radiation, a remnant of the big bang.

Launched: June 30, 2001
Operations ceased: August 19, 2010