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The left hemisphere shows the expanding remnant of the supernova discovered by Tycho Brahe in 1572, here observeret in X-rays . On the right is a map of the cosmic background radiation from one half of the sky, observed in microwaves. Credit: NASA/WMAP Science Team However, using supernovae to measure distances and velocities of galaxies yields 22.7 ± 0.4 km/s, while analyzing the background radiation of the Universe yields 20.7 ± 0.2 km/s.
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