A NASA satellite that’s been orbiting as space junk since 1967, Relay 2, emitted an unexpected, powerful radio burst that astronomers initially struggled to explain.

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The clicking of a turn signal ranks among the least-annoying sounds a car can make. ... As was the case with the thermal spring, the relay clicked every time it moved.

A NASA satellite that’s been orbiting as space junk since 1967, Relay 2, emitted an unexpected, powerful radio burst that astronomers initially struggled to explain.