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Portal Space Systemsportalsystems.spacePortal Space Systems is developing Supernova, a maneuverable solar-thermal spacecraft that delivers sustained delta-v (up to 6 km/s) with autonomous, on-demand control and rapid payload swaps. The system enables persistent presence and fast repositioning across orbits—from LEO to Cislunar space—supporting national security, space-domain awareness, science, exploration, and commercial servicing, including rendezvous, proximity operations, and debris mitigation. Using concentrated solar energy to heat a thermal battery and HEX Thruster, its solar-thermal propulsion offers nuclear-grade performance without reactors, and the company has raised a $50M Series A to advance development.
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