A Giant Cannon for Space
The core idea behind Longshot Space is to replace the most expensive and complex part of a traditional rocket—the massive first stage—with a ground-based launch system. Instead of burning thousands of kilograms of propellant just to leave the launch pad,
Longshot's system uses kinetic energy. In simple terms, it's a huge, sophisticated cannon designed to accelerate a projectile carrying a satellite to hypersonic speeds. The concept moves the energy-intensive part of the launch from an expendable rocket to reusable ground infrastructure, a shift that could fundamentally change the economics of space access. This idea isn't entirely new, with historical precedents like the V-3 cannon from World War II and research projects like HARP in the 1960s exploring similar physics. However, Longshot believes that modern technology and a booming commercial satellite market finally make the concept commercially viable.
How the System Works
Longshot’s technology is a multi-injection accelerator, essentially a long tube or barrel. The process starts with an initial burst of compressed gas to get the projectile moving. As the projectile speeds down the barrel, additional bursts of gas are injected through ports along the side of the tube. The key to achieving incredible speeds is timing these injections with sub-millisecond precision, hitting the back of the projectile just as it passes each port to provide another powerful push. The company’s current prototype is already achieving speeds over Mach 4. The payload, carrying the satellite, doesn't actually reach full orbital velocity from the gun alone. The accelerator is designed to get the projectile through the densest part of the atmosphere. From there, a much smaller, simpler upper-stage rocket motor on the projectile would ignite to provide the final push needed to enter a stable orbit.
The Promise of Lower Costs
The primary driver for this technology is cost. By eliminating the need for a massive, fuel-guzzling first-stage rocket, Longshot aims to dramatically reduce the price of reaching low Earth orbit. While a SpaceX Falcon 9 launch costs around $3,000 per kilogram, Longshot's CEO Mike Grace has stated their system could eventually reach as low as $10 per kilogram. This cost reduction would be transformative for the rapidly growing satellite industry, which is projected to launch tens of thousands of new satellites in the coming years. Beyond just cost, a ground-based system could also increase the frequency of launches, allowing for rapid deployment of satellite constellations without the extensive preparations required for traditional rockets.
Immense Technical Hurdles
While the promise is enormous, the engineering challenges are equally daunting. The ultimate orbital launch system would require a barrel stretching 10 to 15 kilometers long to accelerate a 3,000-kilogram projectile to orbital speeds. Furthermore, any satellite launched this way must be rugged enough to withstand the immense g-forces of such rapid acceleration, though the company argues the ride will be gentler than competing kinetic launch concepts. There is also the matter of atmospheric friction at hypersonic speeds and ensuring the projectile can be aimed with perfect precision. To prove its technology incrementally, Longshot is first targeting the hypersonic testing market for defense clients, a step that allows them to validate their system at speeds around Mach 5 before aiming for orbit.
A New Kind of Space Race
Longshot is not alone in pursuing kinetic launch. Its most well-known competitor was SpinLaunch, which developed a massive centrifuge to spin payloads to high speed before flinging them skyward. However, SpinLaunch shifted its focus away from launch services in 2025 to concentrate on satellite development. Longshot is betting that its gas-gun approach offers a smoother and more scalable path to orbit. The company has already attracted funding from notable investors like Sam Altman and various venture capital firms, along with development contracts from the U.S. military. This interest underscores a broader trend in the aerospace industry: a search for disruptive technologies that can break the old paradigms of space access, making it cheaper, faster, and more routine.
