THE NEW SPACE RACE: For the first time, Blue Origin has ignited an orbital rocket stage.

Twenty days after it rolled out to Blue Origin’s launch site in Florida, the second stage of the massive New Glenn rocket underwent a successful hot-fire test on Monday.

The second stage—known as GS2 for Glenn stage 2—ignited for 15 seconds as part of the “risk reduction” hot-fire test, the company said. The two BE-3U engines, fueled by liquid oxygen and hydrogen and each producing 173,000 pounds of thrust, burned with a nearly transparent flame that approached a temperature of 6,000° Fahrenheit.

This marked the first time that Blue Origin, a space company founded by Jeff Bezos more than two decades ago, has integrated and fired an orbital rocket stage. After the test, Blue Origin said it is still tracking toward a November launch of the New Glenn rocket.

This vehicle is really big, standing 320 feet (98 meters) tall. By comparison, NASA’s titanic Saturn V Moon rocket was 363 feet tall. New Glenn’s first stage will be powered by seven BE-4 rocket engines, which burn methane and liquid oxygen. The performance of these engines has previously been demonstrated in flight on the debut of United Launch Alliance’s Vulcan rocket at the beginning of this year.

Although Monday’s test checked an important box for Blue Origin, there is still much work to do to prepare the New Glenn rocket for its debut. Crucially, the company must complete assembly of the first stage, and then roll this vehicle out from its assembly building a couple of miles to Launch Complex-36, along the Atlantic Ocean.

Then, the first and second stages will be mated. This is a complex endeavor, and as it will be the first time technicians and engineers from Blue Origin attempt the procedure, they will undoubtedly find some issues that need to be addressed. After the vehicles are integrated, the combined stack is due to undergo a short hot-fire test. Following a review of this data, the company is expected to launch the vehicle.

Godspeed.

While I love the work Elon Musk is doing with SpaceX — and fully appreciate how vital it is to our national security and the future of humanity — Musk himself would be the first to tell you it’s unwise to keep all your eggs in one basket.