Henrietta Swan Leavitt (1868-1921)

Unknown to all at the time, her discovery would forever change our understanding of the universe.

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Chandra Finds Relativistic Pinball

The ACIS data suggests cosmic rays come not from the birth of atoms, as originally proposed by Robert Millikan, but from the death of stars.

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Apollo 7 – First Live TV Broadcast

Unfortunately, the tragedy of January 1967 may have only attracted more viewers. Interest in Apollo 7 grew more intense. And when the red light finally turned on, what a show it turned out to be!

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Antikythera Mechanism

The device mimics the complexity of clockwork not designed in Western Europe until a millennium later. What did the ancient Greeks use it for?

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Mariner’s Astrolabe

Who knows where the world would be today without this small, but ingeniously practical, tool!

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