Universe Suddenly Twice As Bright

The universe is twice as bright as it appears, astronomers now suggest. The light bulb went on when they calculated that dust blocks about the half the light emitted from stars and galaxies. Astronomers have known about interstellar dust for a while, but they haven't been able to quantify just how much light it blocks. Now a team of researchers has studied a catalog of galaxies and found that dust shields roughly 50 percent of their light.

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