How to Measure All the Starlight in the Universe
Astrophysicists have devised a clever way to count up the photons in space, stretching back to the cosmos’ adolescence. Until the 20th century, astronomers were stuck on a question that seems as if it should have an easy answer: Why is the night sky dark? If the infinite universe has an infinite numbers of stars, as they assumed, our evening view should be awash in their glow.
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