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

15:00 - 25 Nov 2025

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 pursued: building a spacecraft powered by the heat of focused sunlight. Read More