“The universe is really a shadow theater in which the galaxies are the protagonists, and the CMB is the backlight.” Via QuantaMagazine
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“That light experienced a bulk of the history of the universe, and by seeing how it’s changed, we can learn about different epochs,” saidOver the course of its nearly 14-billion-year journey, the light from the CMB has been stretched, squeezed, and warped by all the matter in its way. Cosmologists are beginning to look beyond the primary fluctuations in the CMB light to the secondary imprints left by interactions with galaxies and other cosmic structures.
“The universe is really a shadow theater in which the galaxies are the protagonists and the CMB is the backlight,” Schaan said.When light particles, or photons, from the CMB scatter off electrons in the gas between galaxies, they get bumped to higher energies. In addition, if those galaxies are in motion with respect to the expanding universe, the CMB photons get a second energy shift, either up or down, depending on the relative motion of the cluster.
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