Fusion Propulsion Startups Target 2027 Orbital Tests to Revolutionize Solar System Travel
Multiple companies are advancing nuclear fusion propulsion for spacecraft, aiming to drastically reduce travel times across the solar system. Pulsar Fusion plans a 2027 orbital demonstration, while Princeton and Helicity Space are developing competing technologies. Experts warn that significant engineering challenges remain, but successful fusion drives could enable missions to Mars, Titan, and potentially interstellar destinations within decades.
Key points
- Pulsar Fusion, a UK-based startup, successfully demonstrated 'first plasma' in March 2026 at its Bletchley facility, using krypton gas to test plasma confinement in its Sunbird engine.
- The company aims to launch a demonstration mission to space in 2027, utilizing helium-3 and deuterium fusion to heat helium-4 propellant, targeting speeds up to 329,000 mph.
- Princeton University’s Starfire project, led by Samuel Cohen, has achieved plasma temperatures of 18 million Fahrenheit but requires reaching 1 billion degrees Celsius for viable deuterium-helium-3 fusion.
- Helicity Space, which raised $5 million in 2023, is developing a drive using plasma pulses rather than continuous fusion, targeting a prototype launch within three years and net energy gain by the 2030s.
- NASA is pursuing fission-based propulsion with the SR-1 Freedom mission, scheduled to launch to Mars by December 2028, as a more immediate alternative to fusion.
Background
Recent advancements in space exploration have focused on both observational capabilities and propulsion technologies. While the James Webb Space Telescope has recently mapped star-forming regions like IC 348 and the Carina Nebula, the focus on propulsion has shifted toward nuclear methods. Previous coverage highlighted the symbolic importance of exploration, such as the ISS crew's Star Trek anniversary tribute, but current efforts are moving from symbolic gestures to tangible engineering milestones in nuclear propulsion.
Why it matters
Successful fusion propulsion could transform space travel by reducing mission durations from months to weeks and enabling access to distant destinations like Saturn’s moon Titan and the asteroid Psyche. It could also free up weight for scientific equipment due to higher efficiency. However, the technology remains unproven at scale, with significant hurdles in plasma containment and miniaturization. If realized, it could eventually enable interstellar travel, fundamentally changing humanity's relationship with the cosmos.
What to watch
Pulsar Fusion is preparing for a 2027 orbital test of its thrusters. Princeton’s team is seeking millions in funding to advance their prototype. Helicity Space aims to launch a prototype within three years and achieve net energy gain by the 2030s. NASA’s SR-1 Freedom mission is scheduled to launch to Mars by December 2028, serving as a precursor for nuclear space hardware.
Want the full story? Read the original reporting
Read on Live Science