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The Cosmic Microwave Background Radiation
Carlos: The cosmic microwave background is nothing less than the heat left over from the Big Bang. This radiation was discovered in 1964 by two very famous engineers, Pencios and Wilson. By then it had cooled down to a mere 2.7 degrees above absolute zero because it'd been traveling for so long. And we can read off these pattern of hot and cold spots what the universe must have had in order to produce such a pattern. It turns out that the spotter universe, the spots tell us about the contents of the universe. Something, some form of elementary particle different from ordinary atoms and that is dark matter.