Q&A with Michel Denis, ExoMars flight director

Towering more than 20 stories tall, the 8-million-pound mobile gantry at the Atlas 5 rocket’s launch pad at Vandenberg Air Force Base, California, was retracted into position late Friday for liftoff of NASA’s InSight mission to Mars.

A technical issue with the United Launch Alliance Atlas 5 rocket that will send NASA’s $2.4 billion Perseverance rover toward Mars has pushed the mission’s launch date back to no earlier than July 30, nearly two weeks into a month-long window for the rover to head to the Red Planet, or else face a two-year delay.

A United Launch Alliance Atlas 5 rocket lifted off at 7:50 a.m. EDT (1150 GMT) Thursday from pad 41 at Cape Canaveral Air Force Station with NASA’s Mars 2020 Perseverance rover.