Magnetic Fields Due to Currents
This is the way we presently launch materials into space. However, when we begin mining the Moon and the asteroids, where we will not have a source of fuel for such conventional rockets, we shall need a more effective way. electromagnetic lunchers may be the answer. A small prototype, the electromagnetic rail gun, can presently accelerate a projectile from rest to a speed of 10 km/s (36 000 km/h) within 1 ms.