After 44 years of travel, Voyager 1 is the most distant human-made object in space May 12, 2021 An undated artist's concept shows NASA's Voyager 1 spacecraft, the first human-made object to venture into interstellar space. PHOTO: 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.