Record Store Day 2014 release.
Limited edition of 600 copies, including 300 copies for UK and Ireland.
Includes a double-sided 35,5 cm x 35,5 cm poster and a coupon for MP3 download.
The source material for these tracks was originally recorded by the Voyager 1 and Voyager 2 space probes. Audible frequencies such as those made by musical instruments are caused by the compression of air or other gases and cannot propagate in a vacuum such as space. The "songs" recorded by the Voyager probes aren't sounds in the conventional sense, rather, they're produced from electromagnetic radiation fluctuations in the magnetosphere of the celestial bodies studied by the Voyager probes.