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March 22, 2013 in Nation/World

This image from the European Space Agency and Planck Collaboration shows the afterglow of the Big Bang, the cosmic microwave background when the universe was 370,000 years old, as detected by the agency’s Planck space probe. It shows tiny temperature fluctuations that correspond to regions of slightly different densities, representing the seeds of all future structure: the stars and galaxies of today.