Stats: Delta 4 history and backlog (updated March 30)

The launch of NASA’s Perseverance Mars rover has been delayed two days to July 22 after an issue with ground support equipment at the Kennedy Space Center held up encapsulation of the spacecraft inside the payload fairing of its Atlas 5 rocket.

This gallery of photos shows the rollout Tuesday of United Launch Alliance’s Atlas 5 rocket and Boeing’s Starliner crew capsule to pad 41 at Cape Canaveral, plus additional views of the 172-foot-tall launcher standing next to the crew access tower Wednesday as teams prepared for a countdown rehearsal.

Two more roll-out solar arrays will ride a SpaceX cargo ship to the International Space Station this weekend, continuing a years-long mid-life station upgrade as NASA plans procurement of a final set of new solar wings to fully reinforce the lab’s power supply.