The Heart and Soul nebulae are over 6,000 light years away, in the constellation Cassiopeia. To capture beauties like these, WISE needs to stay cool enough that its own heat doesn’t distort the infrared images. For this reason, it carries a chunk of solid hydrogen, cryogen, that keeps the on-board telescope at about 17 degrees Kelvin (minus 429 degrees Fahrenheit). With its sensitive infrared vision, WISE can see the cool and dusty crevices of nebulae, where gas and dust are beginning to clump together to form new stars.