Portal Space Systems, founded in 2021 and based in Seattle, is a space startup focused on revolutionizing in-space maneuverability. They are developing the Supernova satellite bus, a payload-agnostic platform powered by a novel solar-thermal propulsion system designed for rapid orbital transfers. With funding from the Department of Defense and Space Force, Portal aims to provide tactical responsiveness and dynamic space operations capabilities. Their primary customer is the U.S. government, specifically the Space Force. Key words: satellite bus, solar-thermal propulsion, in-space mobility, space tug, maneuverability.
All verified mentions of this organization in source documents.
Portal Space Systems’ Starburst and Supernova vehicles are designed to operate across and between multiple orbital regimes, enabling responsive mobility for a range of missions.
Portal Space Systems will validate installation procedures, evaluate on-orbit performance, and refine integration best practices for Space Armor during the mission.
Portal Space Systems emerged from stealth in 2024, secured STRATFI support, raised a large seed funding round, and was named a Via Satellite Top 10 Startup to Watch.
Portal Space Systems purchased Atomic-6’s Space Armor tiles to shield mission-critical subsystems from debris impacts.
Portal Space Systems incorporated Atomic-6’s Space Armor tiles into its Starburst-1 mission to expand sustained maneuverability and longer operational time on orbit for customers.
Portal Space Systems positions maintaining long-term maneuverability as central to its spacecraft offering and requires protecting key systems without sacrificing performance.
The goal of Atomic-6's Space Armor tile system is to protect Portal Space Systems’ Starburst-1 satellite.
Portal Space Systems has introduced Starburst, an ESPA-class rapid-maneuverability spacecraft.
Starburst-1 will launch on SpaceX’s Transporter-18 in Q4 2026 for Portal Space Systems’ first free-flying mission with live payloads.
Portal Space Systems emerged from stealth in 2024 and earned STRATFI support.
Portal Space Systems raised one of the largest publicly announced seed rounds in the spacecraft sector.
Portal Space Systems builds reconfigurable, maneuverable spacecraft designed for defense and commercial missions on operational timelines.
Portal Space Systems plans to launch the demonstrator Starburst-1 on SpaceX's Transporter-18 mission in the fourth quarter of 2026.
The 'Starburst' high-mobility spacecraft was announced by Portal Space Systems on November 5, 2025.
Portal Space Systems has nearly doubled its headcount since raising its seed round this year, reaching about 50 employees and contractors combined.
Portal Space Systems plans to add another 20 employees by next summer.
Portal Space Systems is moving into a larger manufacturing facility in mid-2026.
Portal Space Systems will fly its new vehicle, Starburst, for the first time in 2024.
Portal Space Systems is developing thrusters for precise navigation within orbits and a solar thermal propulsion system for the Supernova vehicle.
Portal Space Systems has manifested its first Starburst on a Transporter mission scheduled for Q4 2026.