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Cosmic Background Radiation

An electromagnetic radiation field at a black body temperature of 2.7 Kelvin that fills the entire universe uniformly to 0.00001 Kelvin. Also known as the Cosmic Microwave Background (CMB), it is thought to be the residual glow from the very hot early universe that followed the Big Bang.

Radio Programs

More Cosmic Background Taking the universe’s temperature October 1, 2015

Cosmic Background The crackle of the Big Bang September 30, 2015

Featured Images

COBE view of the cosmic microwave background

Afterglow November 18, 2014

The Planck space telescope and its view of the cosmic microwave background

Going Dark October 24, 2013

The Milky Way galaxy and the afterglow of the Big Bang make up this all-sky imag

A Little of Everything July 6, 2010