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Ad Astra CEO and former NASA astronaut Franklin Chang Diaz is building a plasma rocket engine that he thinks is our best bet to send people to Mars.

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He called regular, SpaceX-style rockets "primitive."

A Former NASA Astronaut Is Building a Plasma-Powered Mars Rocket

It's a vision in which humankind has gone off world, built an orbital economy, and then watched it slowly disintegrate, like your hometown after the factory closed. It's hard to say if it's plausible, but it's emotionally resonant.

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