Read more and hear it here:A strange rising “howl” was detected by instruments aboard the 36-year-old probe, which has travelled 12 billion miles away from our sun.
The sound was transmitted back to scientists on Earth, over a distance so vast radio waves take 17 hours to reach us. Science site iO9 described the sounds as “creepy” and “wraithlike”.
NASA announced this week that the tiny probe has now left the “solar bubble” - a historic moment which marks our species entry into interstellar space.
The “howls” and “shrieks” detected by Voyager’s instruments - actually waves in plasma in space - provided proof.
The plasma waves are inaudible in space, but , “These frequencies are within the range heard by human ears,” says NASA. “The soundtrack reproduces the amplitude and frequency of the plasma waves as "heard" by Voyager 1. The waves detected by the instrument antennas can be simply amplified and played through a speaker.”
http://uk.news.yahoo.com/nasa-probe-hea ... ml#wIqNOsM