Time-lapse: Falcon 9 lifted vertical on pad 39A (members only)

The Earth observing spacecraft will study clouds and aerosols to further our understanding of climate change. Liftoff happened at 3:20 p.m. PDT (6:20 p.m. EDT, 2220 UTC).

Meet the Vulcan, the next-generation rocket family brought to you by United Launch Alliance that comes with a bold reusability plan, multiple configurations for medium- to heavy-lift, all-American engines and serves as the eventual replacement for the historic Atlas and Delta rocket lines.

Kathy Lueders, NASA’s newly appointed head of human spaceflight operations, said Thursday that without a crystal ball, she could not give a yes-or-no answer when asked whether she believes NASA can put astronauts back on the moon by the end of 2024 as called for by the Trump administration.