The first crewed moon landing in more than half a century may not be pulled off by SpaceX after all.

In April 2021, NASA awarded Elon Musk's company a $2.9 billion contract to provide the first crewed lunar lander for the agency's Artemis program. That vehicle, a modified upper stage of SpaceX's Starship megarocket, is supposed to land astronauts on the moon for the first time on the upcoming Artemis 3 mission.

But NASA isn't satisfied with the pace of Starship's development and is therefore shaking things up, acting agency chief Sean Duffy announced on Monday (Oct. 20).

"I love SpaceX; it's an amazing company. The problem is, they're behind. They've pushed their timelines out, and we're in a race against China," Duffy said on Monday morning, during an appearance on CNBC's "Squawk Box."

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