SpaceX fires up huge Super Heavy booster ahead of 4th Starship test flight (photos, video) SpaceX conducted an engine test with its latest Super Heavy booster on Friday (April 5), readying the giant vehicle for the next Starship launch. https://cdn.mos.cms.futurecdn.net/CxfugAPiAWpdSt6hk3uqLc.jpg https://www.space.com/spacex-super-heavy-static-fire-starship-fourth-test-flight