A SpaceX Dragon cargo freighter departed the International Space Station Tuesday for return to Earth, wrapping up the 20th and final visit to the orbiting research complex for the current version of SpaceX’s supply ship before an upgraded Dragon starts launching later this year. Release from the space station’s robotic arm occurred at 9:06 a.m. EDT (1306 GMT), followed by splashdown in the Pacific Ocean at 2:50 p.m. EDT (1850 GMT).

NASA fired up four hydrogen-fueled main engines on the core stage of the first Space Launch System heavy-lift rocket Thursday in on a test stand in Mississippi, a redo of a crucial hot fire test that was cut short in January by technical issues. The engines burned more than eight minutes in an apparently successful test.

SpaceX’s Falcon 9 rocket is again standing on launch pad 39A at NASA’s Kennedy Space Center in Florida, this time with a Dragon supply ship on top ready to head on a resupply run to the International Space Station.