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…