In the context of special relativity, light does not require a force to keep it moving. Once light is emitted or generated, it travels through a vacuum at a constant speed without the need for a continuous force or propulsion.
According to the theory of special relativity, the motion of light is fundamentally different from that of massive objects. Light consists of particles called photons, which are massless. Massless particles, including photons, always travel at the speed of light in a vacuum, denoted by "c," without any external force acting on them.
The motion of light can be understood through the wave-particle duality of light. Light behaves as both a particle (photon) and a wave. From a wave perspective, light propagates through space by oscillations of electric and magnetic fields, forming an electromagnetic wave. From a particle perspective, photons are emitted or absorbed by charged particles and propagate through space in a wave-like manner.
The constant speed of light is a fundamental principle of the universe, and it plays a significant role in shaping our understanding of physics and the nature of space and time.