Q&A with Michel Denis, ExoMars flight director

The final flight of a discontinued version of Europe’s Ariane 5 rocket added four more spacecraft to Europe’s Galileo navigation constellation Wednesday, giving the multibillion-euro network enough satellites to remain on track for the start of full global service in 2020.

A European spacecraft cruising toward Mars fired its main engine Thursday, tweaking its trajectory and helping set up for carefully-choreographed simultaneous maneuvers Oct. 19 to place part of the tandem mission into orbit around the red planet and deposit a stationary battery-powered lander on the Martian surface.

Russian ground crews moved a Proton rocket to its launch pad in Kazakhstan on Tuesday for liftoff with a Japanese-built broadcasting platform for Turkey’s national telecom satellite operator Friday.