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The United Launch Alliance Delta II interstage is lifted high up at the Vertical Integration Facility at Space Launch Complex 2 on June 12, 2018, at Vandenberg Air Force Base in California. The interstage will be moved in and mated to the top of the booster, or first stage of the rocket. NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) will launch on the final Delta II rocket. ICESat-2 will measure the height of a changing Earth, one laser pulse at a time, 10,000 laser pulses a second. The satellite will carry a single instrument, the Advanced Topographic Laser Altimeter System. ICESat-2 will help scientists investigate why, and how much our planet's frozen and icy areas, called the cryosphere, is changing in a warming climate.