We did not expect this and we are still working to understand the physics of what is happening,' said Karl-Heinz Glassmeier, principal investigator for the Rosetta Plasma Consortium, a set of five instruments on board the spacecraft designed to gather data on the comet's plasma environment. 'This is exciting because it is completely new to us. The result is a strangely rhythmic sound that starts with a percussive purring and then ramps up into a combination of whooshing and clicking noises at an increasingly high pitch. Alien vs Predator Coloring book: Perfect Coloring Book For Adults and Kids With Incredible Illustrations Of Alien vs Predator For Coloring And Having Fun. The oscillations are taking place way below human hearing, so the ESA increased the frequencies to make it audible for people on Earth. But the precise physical mechanism behind the oscillations remains a mystery,' the ESA said. 'The scientists think it must be produced in some way by the activity of the comet, as it releases neutral particles into space where they become electrically charged due to a process called ionisation.

Rosetta's magnetometer experiment first picked up the song when it closed in on the comet back in August.

Rosetta spacecraft snaps gorgeous selfie with its comet buddy.

Landing on a comet is hard: Rosetta searches for the sweet spot.

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NASA's new Soundcloud album: Listen to the exploration of space Predator - Requiem Mp3 Song by Hollywood Studio Symphony, Brian Tyler.

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