Sierra Nevada and United Launch Alliance have announced the most powerful version of the Atlas 5 rocket, with five strap-on boosters and a twin-engine upper stage, will send the first two Dream Chaser cargo missions to the International Space Station from Cape Canaveral in 2020 and 2021, a schedule that still must be confirmed by NASA.

One week after two cosmonauts and a NASA astronaut arrived at the International Space Station for a six-month stay, the three crew members they’re replacing packed up their Soyuz spacecraft for a fiery plunge back to Earth Wednesday evening to close out a 196-day mission.

A Falcon 9 rocket is being readied for a space station resupply mission at Kennedy Space Center’s launch pad 39A . The rocket is scheduled to launch at 10:01 a.m. EST (1501 GMT) on Saturday, weather permitting. Watch live coverage.