Image of the Day: The Most Ancient Light in the Universe

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This image taken over the course of a year by the Planck Observatory Planck observatory during a whole year shows the microwave radiation of our galaxy, the Milky Way created using data covering the electromagnetic spectrum from 30 to 857 GHz, shows something more important than our home galaxy. See those yellow dots over dark red? These are the oldest photons in the universe, which scientists believe formed 380,000 years after the Big Bang, when things started to cool and atoms started to form.

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