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SpaceX is about a week past launching astronauts for the first time but CEO Elon Musk wants employees to focus on developing the company's next-generation rocket, according to an email seen by CNBC.

The company's Starship rocket aims to be fully reusable and launch as many as 100 people at a time on missions to the moon and Mars.

But the Starship development program has suffered several dramatic setbacks and Musk in the email declared it "the top SpaceX priority."