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English, 16.04.2020 20:07 bugbug89

In the 1930s, Grote Reber became known for

discovering a constellation of stars in outer space.
solving a problem with transatlantic telephone service.
discovering the location of the first known black hole.
inventing a telescope that could detect radio signals.

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In the 1930s, Grote Reber became known for

discovering a constellation of stars in outer...

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