Video: Atlas/Cygnus pre-launch news conference

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.

This collection of photographs shows the National Reconnaissance Office’s classified NROL-45 payload, already encapsulated in the Delta 4 nose cone, being moved from the payload processing facility at Space Launch Complex 6 and lifted atop the United Launch Alliance rocket for flight from Vandenberg.

Towering more than 30 stories tall, the mobile gantry structure at the Delta 4-Heavy rocket’s launch pad at Cape Canaveral was wheeled into position for liftoff of the triple-core launcher Thursday with a classified payload for the National Reconnaissance Office.