NASA managers gave the “go” to begin filling the Space Launch System’s core stage with more than 700,000 gallons of super-cold liquid hydrogen and liquid oxygen Saturday at the Stennis Space Center in Mississippi, aiming for the first firing of all four of the huge rocket’s main engines later in the day. NASA TV’s live coverage of the test-firing begins at 4:20 p.m. EST (2120 GMT), around 40 minutes prior to the start of the two-hour test window.
Live coverage of the countdown and launch of a Rocket Lab Electron rocket from Launch Complex 1 on Mahia Peninsula in New Zealand carrying a clandestine payload for the German company OHB. Text updates will appear automatically below. Follow us on Twitter.
Editor’s Note: NASA TV’s live video coverage of the SLS hot fire test begins at 4:20 p.m. EST (2120 GMT) Saturday.