Sowing the seeds

The cosmic microwave background radiation reveals the beginnings of structure in the universe 300,000 years after the Big Bang. Two billion years later, galaxies were in an advanced state of formation. This implies that matter clumped together rapidly after the Big Bang. The presence of structure in the early universe is the best evidence for inflation (see p.48). The idea is that, when the early universe was blown up to form our observable cosmos, microscopic variations in temperature and density were blown up too, and became seeds of today's galaxy clusters and superclusters.

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