Mapping the Baby UniverseIn June, NASA plans to launch the Microwave Anisotropy Probe (MAP) to survey the ancient radiation in unprecedented detail. MAP will map slight temperature fluctuations within the microwave background that vary by only 0.00001 C across a chilly radiation that now averages 2.73 C above absolute zero. The temperature differences today point back to density differences in the fiery baby universe, in which there was a little more matter here and a little less matter there. Areas of slightly enhanced density had stronger gravity than low-density areas. The high-density areas pulled back on the background radiation, making it appear slightly cooler in those directions.
Wanjek, Christopher (NASA Goddard Space Flight Center Greenbelt, MD, United States)
August 21, 2013
January 1, 2003
Publication: Space Science Reference Guide, 2nd Edition