The launch of NASA’s twin GRAIL spacecraft

A United Launch Alliance Delta 2 rocket lifted off Saturday from Vandenberg Air Force Base in California with the JPSS 1 weather satellite, the first in a new line of polar-orbiting observatories for NOAA.

Flying for the 155th and final time, a United Launch Alliance Delta 2 rocket took off from California on Sept. 15 with NASA’s ICESat 2 satellite.

United Launch Alliance’s final Delta 2 rocket is now on display at the Kennedy Space Center Visitor Complex in Florida, a monument to an industry workhorse that helped build the GPS navigation satellite fleet and enabled a new era of Mars exploration.