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Uncommon thinkers: How Portal’s Jeff Thornburg plans to harness the heat of the sun in the cold of space

BOTHELL, Wash. — Before he became the CEO of Portal Space Systems, Jeff Thornburg worked for two of the world’s most innovative space-minded billionaires. Now he’s working on an idea those billionaires never thought to pursue: building a spacecraft powered by the heat of focused sunlight.Thornburg and his teammates are aiming to make Bothell-based Portal the first commercial venture to capitalize on solar thermal propulsion, a technology studied…
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nexusnewsfeed.com broke the news in on Monday, December 1, 2025.
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