Jeff Bezos tweets a snarky congrats to Elon Musk

SpaceX has just taken another important step in the race for reusable space rockets.

The SpaceX rocket that landed Monday successfully launched satellites into orbit.

The mission’s primary objective was commercial: the company had been commissioned to launch satellites for the New Jersey-based communications company OrbComm. If they can stick the landing, it’ll be a watershed moment for space travel.

The landing marks the first time SpaceX has attempted to vertically park a Falcon 9 rocket stage back on solid ground after flying a payload to orbit. He learned the happy truth when he went back into Launch Control and saw video of the standing rocket.

It’s much harder in real life – which is why SpaceX founder Elon Musk was so excited when the Falcon 9 landed intact near its launch pad at Cape Canaveral on Monday night after launching satellites to space.

Musk and others have said that making a reusable rocket would reduce costs by a factor of a hundred – thereby making interplanetary travel possible. The SpaceX rocket is faster and more complex, meaning it was a bit harder to pull off than Blur Origin’s test, but it’s still huge. It was also the second of its type of achievement in a month, following the landing of a rocket by Jeff Bezos owned Blue Origin.

Bezos didn’t respond to Musk’s tweets at that time, but he clearly sought to put his own company’s achievements ahead of SpaceX’s in his “congratulations” on Tuesday, tweeting “Welcome to the club!”