Technology

What we learn from noisy signals from deep space

What we learn from noisy signals from deep space

Look up. Somewhere beyond our solar system, where it’s well below zero, ­pitch-dark, and the next-nearest star is a 400-century ride away, an electrical charge sparks a radio signal. The blip is faint, some 22 watts, no more power than a typical refrigerator bulb needs. The source is ­Voyager I. Its 12-foot antenna is calling home from the blackness.

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