This is a baby picture of our universe, 13.8 billion years ago, before there were stars, galaxies or planets. The image was created by the European Space Agency's Planck satellite that measures the cosmic microwave background from the Big Bang. The universe spent the first 380,000 years of its existence as an opaque and extremely hot "soup" of elementary particles, protons, neutrons and photons. Once the universe cooled sufficiently atoms began forming and light was free to travel. That first light is what the Planck satellite captured in this image displaying tiny fluctuations in the temperature of the radiation.
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