Elon Musk promised to build a fully reusable rocket 13 years ago, and today, SpaceX’s Starship is designed to be 100% reusable and can potentially fly again within an hour.

Tesla and SpaceX CEO Elon Musk said Friday that his rocket company has made great strides in reusability, a goal he set 13 years ago.

What happened: Musk responded to a post on a fan page on the platform that shared a video of Musk from 13 years ago discussing his ambitious goal of developing a fully and rapidly reusable rocket.

Tech moguls responded to the video, saying SpaceX’s Falcon 9 rocket is now about 75% reusable, with several days between flights.

Additionally, the company’s Starship is designed to be 100% reusable, potentially “able to fly again within an hour of landing.”

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“This is the key to achieving a multi-planetary civilization,” he said.

Why it matters: Earlier this month, Musk revealed that the fifth test flight of the Starship rocket had been delayed, pushing the schedule back to later this month — a significant delay from its previous August 2 date.

Musk’s SpaceX is also facing allegations of water contamination at its Starship facility in Texas. The company has denied the claims and said the reports were factually incorrect.

Last month, SpaceX denied reports that its Boca Chica operations were threatening the plover population, with Musk downplaying environmental concerns and saying only a few bird nests had been destroyed.

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