Sphäre Sechs is a dark ambient project by Martin Stürtzer (Phelios) and Christian Stritzel. The music is exclusively about deep space. They have released six albums in total. The music on the first album, Tiefschlaf, was recorded live during a sleep-concert, which took place in the Sophienkirche in Wuppertal in September 2011. A second album, Enceladus, was released by Malignant Records in 2015. Cryo Chamber label released the next three albums Particle Void, Transient Lunar Phenomenon, and Beta Pictoris.