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.
StarDate depends on the support of listeners and astronomy enthusiasts like you. Please consider making a tax-deductible contribution to StarDate.
For more skywatching tips, astronomy news, and much more, read StarDate magazine.
Keep up with everything in the sky with a subscription to our daily radio program, hosted by Sandy Wood.
StarDate is brought to you in part through the generous support of our underwriters. Interested in underwriting? Let us know.
©1995-2012 The University of Texas McDonald Observatory
