Cosmic Microwave Background Evidence For Dark Matter
The cosmic microwave background dates from a time when the universe was about. At this time the universe was an expanding gas composed primarily of protons electrons photons neutrinos and dark matter.
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That light the cosmic microwave background radiation cmbr comes to us from every direction in the sky uniform ex.
Cosmic microwave background evidence for dark matter. The cosmic microwave background radiation reveals what the universe was like when it was only a few hundred thousand years old long before galaxies and clusters of galaxies were formed. It gives us a. The first strong hints of a dark universe came from observations of the cosmic microwave background the ancient afterglow light pattern from the hot and sweaty early years of the universe.
Roughly 380 000 years after the big bang about 13 7 billion years ago matter mostly hydrogen cooled enough for neutral atoms to form and light was able to traverse space freely. The cosmic microwave background represents a time when the universe was much smaller and denser with all matter flowing as superheated plasmas of mostly hydrogen and some helium. Astronomers studying the cosmic microwave background cmb have uncovered new direct evidence for dark energy the mysterious substance that appears to be accelerating the expansion of the universe.
Their findings could also help map the structure of dark matter on the universe s largest length scales. The cosmic microwave background is blackbody thermal radiation at millimeter wavelengths in the radio portion of the electromagnetic spectrum and as we observe it at present it has a temperature of a little under 3 degrees above absolute zero see image above which has the characteristic thermal blackbody shape. It fills space in every direction in which one observes and is remarkably uniform in intensity.
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