The sources of many of these background radiations have remained long-standing puzzles, but this millennial year brought some partial resolutions. The size and distribution of these spots indicates a geometrically flat universe , which, when combined recent supernovae results , indicate a universe with an accelerating expansion rate filled with dark matter and dark energy . Pictured above , a map spanning ten degrees of the microwave sky resolves the microwave background into hot and cold spots, as indicated in micro kelvins .
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