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List of electromagnetic projectile devices in fiction
Electromagnetic projectile devices often appear in fiction, especially science fiction where they are described as Kinetic energy weaponry, gauss guns, mass drivers or railguns. However, their fictional behavior rarely matches that of real-life projectile devices, which are typically much less powerful and far more bulky.
==Realism of depictions==
Some fictional sources describe the projectile as moving at significant fractions of the speed of light, implying an unrealistically high amount of energy given current human capabilities.〔()〕 The coordinate mass (mass accounting for effects of special relativity based on velocity) of a projectile is , where m is the coordinate mass, and v is the velocity. As the velocity of the projectile increases, the total mass increases quickly, making it immensely hard for velocities of such magnitude to be attained. To date only microscopic particles have been induced to go so fast through human technology.
In fiction they can depicted as firing inert projectiles from orbit directly at planetary surface targets (EG: Babylon 5, series 2 – the Centauri invade the Narn home world after an attack using "Mass Drivers") as if the target and the shooter are not moving relative to each other, and do not have a gravity well nearby to effect the projectiles' trajectory. They point the gun at the target, and shoot, and hit the target, from orbit.
In reality, at least if the muzzle velocity is not much greater than the orbital velocity, they would not be aiming at the surface, but firing behind their orbit, so that the projectiles would lose their orbital velocity and free-fall to the surface.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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