Video: Time lapse of ATV’s final departure from ISS

SpaceX test-fired a Falcon 9 rocket at Cape Canaveral Friday evening, igniting nine Merlin engines for several seconds while hold-down restraints kept the launcher on the ground. The company also confirmed the rocket is scheduled for takeoff Wednesday on a space station resupply mission, three days later than previously planned.

Europe’s top rocket contractor is pressing ahead with development of the Ariane 6 rocket, a versatile launcher with half the cost of Europe’s current Ariane 5 booster, keeping the new vehicle on track for its 2020 debut.

Europe’s Sentinel 3B environmental satellite was shipped to the Plesetsk Cosmodrome in Russia’s far northern Arkhangelsk region in March for a month-long campaign to prepare the spacecraft for liftoff aboard a Rockot launcher.