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.

A United Launch Alliance Delta 2 rocket fired away from a California military base and disappeared into an overcast cloud deck Saturday on its final flight, carrying a NASA research satellite into orbit and closing the book on a nearly 30-year legacy of launches.

NOAA’s JPSS 1 weather satellite is enshrouded inside the nose fairing of a Delta 2 rocket, awaiting liftoff from Vandenberg Air Force Base in California on a seven-year mission to collect data to improve global weather forecasts.