An electromagnetic railgun is exactly what it sounds like: it uses electricity and magnetic forces to propel bullets, instead of gunpowder or other chemicals.
Earlier this month, General Atomics Electromagnetic tested out railguns at US army testing grounds in Utah, shooting out projectiles that had accelerated with more than 30,000 times than the force of gravity.
The railgun was able to hit targets more than 100 miles away in around 6 minutes.
