From exoplanet weather maps to a look inside the darkest corners of our Milky Way, the Spitzer Space Telescope has revolutionized infrared, or heat seeking, astronomy, and yielded incredible science. But next week it will use up the last of the coolant used to keep the telescope at three degrees above absolute zero - the better to detect the faintest heat - and the craft will transition to its "warm mission".
About 23 degrees above absolute zero.
JPL explains in this video.
Credit: NASA/JPL-Caltech/G. Laughlin (UCO/Lick Observatory)