The sound of a comet

The Rosetta mission to Comet 67P/Churyumov-Gerasimenko has recorded the sounds you can hear below.

The sounds, or “singing,” of the comet were not expected to be there. They are in the 40-50 millihertz frequency and it is not known why they occur. The sounds have been amplified 10,000 times to make them audible to the human ear.