SpaceX's giant Starship rocket just cleared a major hurdle on the road to its second-ever liftoff.

The U.S. Federal Aviation Administration (FAA) announced today (Oct. 31) that it has wrapped up its Starship safety review, which assesses the risks that a launch might pose to public health and property.

However, there's still another regulatory box to check before SpaceX can get a license for the next Starship liftoff.

"The FAA is continuing to work on the environmental review," the agency wrote today in an emailed statement. "As part of its environmental review, the FAA is consulting with the U.S. Fish and Wildlife Service (USFWS) on an updated Biological Assessment under the Endangered Species Act. The FAA and the USFWS must complete this consultation before the environmental review portion of the license evaluation is completed."

Starship is the biggest and most powerful rocket ever built. It consists of two fully reusable elements — the Super Heavy booster and Starship upper stage — and stands nearly 400 feet (122 meters) tall when fully stacked.

The full-size vehicle has flown just once to date, on a test flight that launched on April 20 from Starbase, SpaceX's seaside facility in South Texas. 

That mission aimed to send the Starship upper stage partway around the world, with splashdown targeted for the Pacific Ocean near Hawaii. But Starship suffered several problems shortly after liftoff, including a failure of separation for its two stages. As a result, the vehicle was intentionally detonated above the Gulf of Mexico.