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United Launch Alliance (ULA) workers assist as the Delta II first stage is lifted to vertical at Space Launch Complex 2 on June 8, 2018, at Vandenberg Air Force Base in California. The booster will be moved into the mobile service tower. 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.