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Yes—a gun can fire in the vacuum of space. A cartridge carries the materials needed to make its propellant burn, so it does not need oxygen from surrounding air. What happens after the shot is less familiar: the shooter recoils, and the projectile keeps moving, subject to gravity and other forces.
Why a gun can fire without air
Ammunition contains its own oxidizer, so a cartridge’s propellant reaction does not depend on oxygen drawn from the atmosphere. NASA describes conventional smokeless gunpowder being used as the first stage of a two-stage light-gas gun; that stage works on the same basic principle as firing a bullet. The gunpowder drives a piston, which compresses hydrogen; the expanding hydrogen then launches a test projectile into an evacuated target chamber. NASA White Sands Test Facility and Space.com describe the mechanism.
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This demonstrates that a projectile can be propelled into a vacuum-simulating environment. It does not prove that every ordinary pistol or rifle would function reliably in outer space: the NASA equipment is a specialized research launcher, not a handheld firearm test in space.
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The shooter recoils
When the projectile and propellant gases move forward out of the barrel, the firearm and shooter are pushed in the opposite direction. A freely floating shooter would recoil, but the resulting motion would depend on the masses involved and whether the person or firearm was restrained. Without those details, it is not possible to give a meaningful recoil speed.
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The projectile keeps moving
After leaving the barrel, the projectile continues moving. With no ordinary atmospheric drag, its motion is not slowed in the familiar way a bullet is in air. But it would not necessarily travel in a perfectly straight line forever: gravity and other forces can change its path.
The visible plume would differ from a familiar gunshot
Astronomer Peter Schultz, who studies impact craters, told Space.com that the smoke trail would appear as “an expanding sphere of smoke from the tip of the barrel.” That is Schultz’s explanation of the expected appearance, not a report of a NASA test firing a conventional gun in space. Space.com’s explanation discusses the expected plume.
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What NASA’s vacuum tests do—and do not—show
NASA’s light-gas guns are built for hypervelocity impact research. Their operating figures describe specialized apparatus and conditions, not the muzzle velocity or performance of a normal firearm.
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|---|---|
| Up to 27,500 feet per second | Reported capability of NASA White Sands Test Facility’s two-stage light-gas guns in 2016; not an ordinary firearm’s muzzle velocity. NASA White Sands Test Facility |
| Below 1 torr | Typical pressure reported for impacts at NASA’s Experimental Impact Laboratory; the page’s publication date is not stated. NASA Experimental Impact Laboratory |
| Above 7 km/s (4.2 miles/s) | Stated capability of the Experimental Impact Laboratory’s 5.56-mm light-gas gun, not a standard firearm; the page’s publication date is not stated. NASA Experimental Impact Laboratory |
| Around 9 to 10 kilometers per second | Velocity achieved by researchers using a miniature light-gas gun, as described in a 2013 NASA Langley article; not ordinary small-arms performance. NASA Langley Research Center |
These examples establish that specialized launchers can propel test projectiles under vacuum-related test conditions. They should not be read as evidence that a conventional handheld gun has been fired in outer space or as a guarantee that a particular model would work there.
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Would every firearm work in space?
That is not established. The evidence supports the core answer—propellant does not need ambient oxygen, and a projectile can be launched into a vacuum-simulating chamber—but does not establish model-by-model reliability for ordinary firearms in space. A firearm’s performance would depend on its design and operating conditions.
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