Science Floats- page 7 | Space | Air & Space Magazine
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Science Floats

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For the next 15 billion years, the universe expanded and cooled. Had observers been present when the cosmos was about 500,000 years old, and had they looked back towards is infancy, they would have seen these seismic features in optical wavelengths, and the seismic features appear as the minute temperature variations in the cosmic microwave background.

 

 

 

 

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