The Falcon 9 booster assigned to launch two NASA astronauts on an orbital test flight of SpaceX’s Crew Dragon capsule has been test-fired in Texas, but the schedule for the long-awaited mission remains unclear.

An unmanned cargo freighter carrying nearly four tons of supplies and science, launched and operated commercially for NASA, blasted off from Cape Canaveral on Tuesday atop an Atlas 5 rocket bound for the International Space Station.

Europe’s Sentinel 2A land imaging satellite designed to glimpse cities, farms and forests from orbit launched aboard a Vega rocket. The 2,500-pound satellite lifted off at 0151:58 GMT Tuesday (9:51:58 p.m. EDT Monday).