In 1933, Bell Labs engineer Karl Jansky followed a faint radio hiss, and this discovery opened the door to radio astronomy

An engineer’s quest to fix radio interference in 1933 unexpectedly led to a monumental discovery. Karl Jansky’s rotating antenna detected a mysterious, periodic hiss, not from Earth or the Sun, but from the Milky Way’s center. This groundbreaking finding, revealing the galaxy emits radio waves, birthed radio astronomy and revolutionized our understanding of the cosmos.

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