Q&A with Elon Musk, SpaceX’s founder and CEO

Four days after a Soyuz ferry craft brought three space station fliers down to a frigid landing in Kazakhstan, three fresh crew members are poised for launch early Tuesday from the Baikonur Cosmodrome to boost the lab’s crew back to six.

In one of the strongest public endorsements of SpaceX’s initiative to put a reusable launcher on the commercial market, a top official from satellite communications giant SES said Tuesday that the company wants to fly one of its pricey payloads on a used Falcon 9 rocket, perhaps even without a test flight.

Riding a self-propelled transporter, an Orbital ATK Antares rocket rolled out to it launch pad Thursday on Virginia’s Eastern Shore for final preparations to send a Cygnus supply ship to the International Space Station.