THE NEW SPACE RACE: SpaceX tests previously flown Super Heavy booster.

SpaceX is having trouble with Starship’s upper stage after back-to-back failures, but engineers are making remarkable progress with the rocket’s enormous booster. The most visible sign of SpaceX making headway with Starship’s first stage—called Super Heavy—came at 9:40 am local time (10:40 am EDT; 14:40 UTC) Thursday at the company’s Starbase launch site in South Texas. With an unmistakable blast of orange exhaust, SpaceX fired up a Super Heavy booster that has already flown to the edge of space. The burn lasted approximately eight seconds, Ars reports.

This was the first time SpaceX has test-fired a “flight-proven” Super Heavy booster, and it paves the way for this particular rocket—designated Booster 14—to fly again soon. A reflight of Booster 14, which previously launched and returned to Earth in January, will happen on the next Starship launch, SpaceX confirmed Thursday. “This booster previously launched and returned on Flight 7 and 29 of its 33 Raptor engines are flight proven,” the company said. “The first Super Heavy reuse will be a step towards our goal of zero-touch reflight.”

The next Starship flight test is expected late this month or in May.