This recording was produced by converting into audible sounds some of the radar echoes received by Huygens during the last few kilometres of its descent onto Titan. As the probe approaches the ground, both the pitch and intensity increase. Scientists used the intensity of the echoes to speculate about the nature of the surface.
Image credit: ESA/NASA
Audio: ESA/HASI (M. Fulchignoni), CC BY-NC-SA 3.0 IGO
Licence : All Rights Reserved