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By Will Dunham WASHINGTON (Reuters) – The classic 1979 sci-fi horror film “Alien” was advertised with the memorable tagline, “In space, no can hear you scream.”

It did not say anything about humming. Instruments aboard NASA’s Voyager 1 spacecraft, which nine years ago exited our solar system’s outer reaches, have detected a faint monotonous hum caused by the constant vibrations of the small amounts of gas found in the near-emptiness of interstellar space, scientists said.

It essentially represents the background noise present in the vast expanse between star systems. These vibrations called pe…

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