Q&A with Curt Blake, president of Spaceflight Industries (members only)

Carrying a sophisticated billion-dollar missile detection satellite for the U.S. military, a United Launch Alliance Atlas 5 rocket lifted off from Cape Canaveral on Tuesday with 1.6 million pounds of thrust from a Russian RD-180 main engine and twin solid rocket boosters.

SpaceX’s second Falcon Heavy rocket lifted off Thursday with the Arabsat 6A communications satellite. The world’s most powerful operational launcher lifted off from pad 39A at NASA’s Kennedy Space Center in Florida at 6:35 p.m. EDT (2235 GMT), and its three first stage boosters landed less than 10 minutes later — two back at Cape Canaveral and one on a drone ship at sea.

NASA astronaut Bob Behnken, now in the second half of his mission to the International Space Station aboard SpaceX’s Crew Dragon spaceship, glimpsed the commercial crew capsule from a unique viewpoint at the far end of the station’s solar power truss during a pair of recent spacewalks.