A British startup has just done what no private company has achieved before: igniting plasma inside a nuclear fusion-powered rocket engine, and if it works at scale, trips to Mars could take weeks instead of months.

Written by Douglas Avila

Published on 13/04/2026 at 11:02

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A British startup Pulsar Fusion from Bletchley achieved the first plasma ignition inside a nuclear fusion rocket engine in March 2026, using the Sunbird Mark I prototype with krypton as propellant and electromagnetic fields to confine and accelerate particles

In March 2026, at Amazon’s MARS conference organized by Jeff Bezos in California, Pulsar Fusion did what no private company had achieved before. The British startup ignited plasma — the fourth state of matter, electrically charged and extremely hot — inside a prototype nuclear fusion rocket engine called Sunbird Mark I. The test was streamed live and represented a milestone in space propulsion.

Nuclear fusion propulsion promises speeds of up to 800,000 km/h and up to 1,000 times more thrust than conventional orbital thrusters. Therefore, if the technology works at scale, trips to Mars that currently take months could be completed in a few weeks, drastically reducing the risks of space radiation and prolonged microgravity for astronauts.

How the Sunbird generates plasma and why this changes everything in space propulsion

Plasma confined in a magnetic field in the Pulsar Fusion laboratory

The Sunbird Mark I operates by generating confined plasma within an exhaust architecture. Electric and magnetic fields direct and accelerate charged particles through the engine channel. In the March test, the propellant used was krypton, chosen for its high ionization efficiency at low mass flow rates.

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Chemical rocket vs fusion: why the difference is 50 times

Comparison between chemical rocket and Pulsar Fusion nuclear fusion propulsion

Current chemical rockets offer high thrust but have an exhaust velocity limited to about 4-5 km/s and a typical specific impulse of 450 seconds. Thus, trips to Mars take 7 to 9 months. Electric thrusters are more efficient but extremely slow. Pulsar Fusion aims to combine the best of both worlds: high thrust and high exhaust velocity.

However, it is crucial to emphasize that the March test generated plasma, but not a nuclear fusion reaction per se. As noted by experts, igniting plasma is not that difficult — the real challenge is confining plasma at sufficient densities and pressures to sustain fusion. The company plans upgrades with superconducting magnets and collaboration with the UK Atomic Energy Authority to advance.

What is needed for Pulsar Fusion to take fusion to space — and why it is still early to celebrate

Spacecraft with Pulsar Fusion propulsion traveling to Mars

Pulsar Fusion, founded in Bletchley, has a long way to go. The next steps include thrust scale testing, specialized probes, and drag potential analyzers to measure actual exhaust velocity. Furthermore, the company has not yet disclosed funding amounts raised.

Still, the milestone is historic. Since the 1960s, with the Orion Project and NASA’s NERVA, no one had demonstrated plasma confinement in fusion exhaust architecture. The global race for disruptive energy technologies finds in Pulsar Fusion one of the boldest candidates — even if functional fusion is still years away.

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A British startup has just done what no private company has achieved before: igniting plasma inside a nuclear fusion-powered rocket engine, and if it works at scale, trips to Mars could take weeks instead of months.

A British startup Pulsar Fusion from Bletchley achieved the first plasma ignition inside a nuclear fusion rocket engine in March 2026, using the Sunbird Mark I prototype with krypton as propellant and electromagnetic fields to confine and accelerate particles

How the Sunbird generates plasma and why this changes everything in space propulsion

Chemical rocket vs fusion: why the difference is 50 times

What is needed for Pulsar Fusion to take fusion to space — and why it is still early to celebrate

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A British startup has just done what no private company has achieved before: igniting plasma inside a nuclear fusion-powered rocket engine, and if it works at scale, trips to Mars could take weeks instead of months.

A British startup Pulsar Fusion from Bletchley achieved the first plasma ignition inside a nuclear fusion rocket engine in March 2026, using the Sunbird Mark I prototype with krypton as propellant and electromagnetic fields to confine and accelerate particles

How the Sunbird generates plasma and why this changes everything in space propulsion

Chemical rocket vs fusion: why the difference is 50 times

What is needed for Pulsar Fusion to take fusion to space — and why it is still early to celebrate

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In Botswana, a salt flat of up to 16,000 km² that was once an African megalake spends months as an absolute white desert, but during the rainy season it transforms into a shallow sea that reappears from nowhere and can be seen from space in the middle of southern Africa.

A giant half-ton ring fell in Kenya from space, and more than a year later, scientists still do not know where it came from.

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