Last May, NASA launched a small, bread loaf-sized satellite into orbit around Earth. Dubbed IceCube, the satellite's mission was to measure cloud ice in our planet's atmosphere -- a challenging task that researchers have previously only been able to perform in limited ways. Sensing ice clouds requires measurements at a range of frequency bands but particularly within what are known as submillimeter wavelengths, or electromagnetic wavelengths that fall in between those of microwave and infrared waves. The problem is, instruments that can take those kinds of measurements have previously had to be on board high-altitude research aircraft, meaning measurements were limited to the areas where those aircraft were flying. Launching a satellite that can perform those measurements could open up what parts of the atmosphere can be studied, and that's where IceCube comes in.