Live coverage: Ariane 5 launches for DirecTV

Vibration testing on the James Webb Space Telescope, the multibillion-dollar successor to Hubble, has resumed after engineers traced a problem that cropped up last month to a restraint holding part of the observatory’s giant segmented mirror in place for launch.

Continuing a high-tempo launch cadence, SpaceX delivered another batch of 60 Starlink internet satellites to orbit early Thursday after a seemingly flawless liftoff from Cape Canaveral aboard a Falcon 9 rocket.

Europe’s first mission to Mercury, a quartet of Galileo navigation spacecraft, the world’s first global winds observatory, and a new European weather satellite have arrived at an equatorial launch base in French Guiana in preparation for launches in the coming months.