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How The Oldest Light In The Universe Got Here

This artist's animation depicts the 'life' of a photon, or particle of light, as it travels across space and time, from the very early universe to the Planck satellite. By creating maps of the oldest light in the universe, Planck scientists are learning about the epic journey of light through the cosmos. The mission's maps showing this ancient light, called the cosmic microwave background, have revealed the most precise information yet about the universe's fundamental traits, such as its age, contents and the seeds of all structure, without which we would not exist.

Credit: NASA/JPL-Caltech

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