Q&A with Michel Denis, ExoMars flight director

Arianespace’s first launch of 2020 lifted off at 4:05 p.m. EST (2105 GMT; 6:05 p.m. French Guiana time) Thursday from the Guiana Space Center on the northeastern shore of South America. An Ariane 5 rocket launched the Eutelsat Konnect and GSAT 30 communications satellite for Eutelsat and the Indian Space Research Organization.

Two astronauts ventured outside the International Space Station Friday for the first of four spacewalks to repair a $2 billion cosmic ray detector, breezing through work to prep the device for invasive surgery to splice in new coolant pumps and extend the instrument’s life probing the composition of the universe.

Arianespace has split its third order of Vega rockets from Italy’s Avio between old and new versions of the solid-fueled booster, as officials prepare to build a final batch of around 18 Ariane 5 rockets before switching to the next-generation Ariane 6 in the early 2020s.