Oldest Stars in Universe Younger Than Thought

A few hundred million years after the Big Bang, the light from some of the very first stars and galaxies lit up the universe and ended a period known as the "dark ages." New measurements by the European Space Agency's Planck satellite—which studied the cosmic microwave background, or the light left over from the Big Bang—indicate that this period of light began about 100 million years later than Planck's previous estimate. The new results are based on an additional year of observations recorded by the satellite.

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