Live coverage: Space station crew safely returns to Earth

These narrated videos show the pre-launch preparations that readied the United Launch Alliance Atlas 5 rocket and the Orbital ATK Cygnus commercial cargo-delivery spacecraft for flight and rolling to Complex 41 for liftoff to the International Space Station.

If confirmed, Isaacman, 41, would be the fifth NASA administrator with spaceflight experience, replacing former Democratic Sen. Bill Nelson, who flew into orbit aboard the space shuttle Columbia in early 1986.

An Atlas 5 rocket successfully launched another Cygnus cargo freighter for Orbital ATK Tuesday night, fulfilling the booster’s role of reestablishing America’s resupply link to the International Space Station.