On Saturday, NASA will attempt to launch its Ice, Cloud and land Elevation Satellite-2, or ICESat-2, a satellite that will help researchers measure the height of natural features on Earth. With the help of a powerful on-board laser, ICESat-2 will measure changes in Earth's ice across seasons and years. "Retreating glaciers. Shrinking sea ice. Melting ice sheets. The frozen reaches of Earth are changing at dramatic rates," NASA said, "and the impacts, from sea level rise to altered weather patterns, span the planet." So ICESat-2's mission is to collect incredibly precise measurements of Earth's ice as well as the heights of other features like forests, oceans and clouds.