Cosmic Log

BOTHELL, Wash. — From the outside, Portal Space Systems’ headquarters looks like a standard-issue office space in a Bothell business park. But inside, the Portal team is working to harness the heat of the sun, to speed up how spacecraft get around.

“Think about it as finally bringing what you see in Star Trek into reality in orbit, to actually move spacecraft the way Hollywood had originally intended,” Jeff Thornburg, Portal’s CEO and co-founder, said at today’s ribbon-cutting ceremony for the 8,000-square-foot development lab and HQ.

The hardware that’s spread across Portal’s lab tells you that the four-year-old venture is no typical business-park tenant: In one corner, there’s a gleaming vacuum chamber where components for Portal’s solar thermal propulsion system are being tested. In another corner, a 3D printer stands ready to turn out the parts for subscale test models of the system’s heat-exchanger thruster.

Portal plans to build the system into its Supernova satellite platform. Supernova is designed to use foldable mirrors to focus the sun’s rays onto a heat exchanger. When ammonia passes through the heat exchanger, it rapidly builds up pressure and produces thrust.

Thornburg said the system provides several advantages over traditional rocket thrusters. For example, there’s no need for oxidizers or hard-to-handle cryogenic fuels. “We’re not burning anything,” Thornburg said. “We’re just concentrating the solar energy.”

The biggest advantage is that Supernova should be able to push itself and its attached payload into different orbits much more quickly than your typical spacecraft. “It has the ability to maneuver like nothing else that exists in orbit, which means it can go from low Earth orbit or medium Earth orbit to geostationary orbits within hours or a day,” Thornburg said. “Or it can move from one orbit to another quickly to accomplish a commercial or a defense mission with speeds that typically take weeks and months.”