Launch of a Russian Soyuz spacecraft Friday carrying three fresh crew members to the International Space Station will boost the lab’s crew back to six and, most important from NASA’s perspective, dramatically boost research with four crew members — three NASA astronauts and a veteran European flier — available to operate experiments in the American segment of the laboratory.

A Boeing-built communications satellite lifted off at 7:21 p.m. EDT (2321 GMT) Monday on top of a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida. The spacecraft will add to Inmarsat’s Global Xpress network linking airplanes, ships and other mobile terminals with broadband Internet and data services.

Returning home after a 64-day test flight, astronauts Doug Hurley and Bob Behnken blazed through Earth’s atmosphere and parachuted into the Gulf of Mexico inside a SpaceX Crew Dragon spacecraft Sunday, a final major step before NASA formally certifies the crew capsule for operational missions to the International Space Station.