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Atom & Cosmos

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Milky Way

CRUNCH THE NUMBERS  Scientists estimate that the Milky Way contains 100 million black holes.

aurora

CHARGED UP  Auroras are triggered in Earth’s atmosphere by the solar wind, a constant stream of charged particles wafting away from the sun. This photo of an aurora was taken from the International Space Station on June 26.

During a total solar eclipse in 1919, Arthur Eddington and colleagues tested Einstein’s theory of gravity. Although the results showed Einstein’s theory was correct and Newton’s was wrong, Newton’s math was good enough to predict where the eclipse would be.

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