Q&A with Eric Smith, JWST program director

After an unusual stretch of excessive high-altitude winds prevented launch from French Guiana of 53 small satellites on a Vega rocket in June — and no sign of a letup in winds in the coming days — Arianespace said Wednesday that the mission will be delayed to Aug. 17 to allow time for teams to recharge launcher and payload batteries.

A Soyuz rocket took off from French Guiana on Thursday with the SES 15 communications satellite, a craft heading for an orbit more than 22,000 miles over the equator to provide airborne wifi and aeronautical navigation services over the United States.

A European Ariane 5 rocket will propel two communications satellites from a standstill to a speed of nearly 21,000 mph in 25 minutes during a launch Friday from French Guiana.