Public domain image of an underwater nuclear weapons detonation test during the Cold War.

The science behind Hitler’s atomic bomb

J. Robert Oppenheimer

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The Universe is out there, waiting for you to discover it.

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Ethan Siegel

Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.