This enormous section of the Milky Way galaxy is a mosaic of images from NASA's Wide-field Infrared Survey Explorer, or WISE. The constellations Cassiopeia and Cepheus are featured in this degree expanse.
ESA astronaut Alexander Gerst shared this photo on social media with the comment: "Safe to say, this was the most amazing thing I have done in my life. The pump module I carry here has a mass of 400 kg. I could move it with my little finger.