Ripples in the cosmic background: "The light appears extremely uniform in brightness across the sky. Astronomers have discovered, however, that the radiation has very faint ripples and bumps in it, at a level of only about one part in one hundred thousand.
These ripples reflect the architecture of the universe when the light was freed, and the subsequent cosmic structures (galaxies and clusters of galaxies) as the light passed by them on its journey through space and time. These ripples hold clues, therefore, to the early universe and how it has evolved, and are consequently among the top priorities of modern astronomy research."
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