What fundamental force or mechanism drives the continuous forward motion of light, and how does light maintain its speed?
Context This question explores the underlying physics behind light's propagation. It delves into whether a specific force is responsible for pushing light forward or if its motion is inherent to its nature. Understanding the answer requires grasping concepts from electromagnetism and quantum mechanics. It is important to understand how the electromagnetic field and photons play a role in the light's motion. Simple Answer Light is made of tiny packets of energy called photons. Photons don't have any mass. Because they have no mass, photons always travel at the speed of light. Light's movement isn't because of a force pushing it, it's just how light behaves. It's the nature of light to move at this speed, defined by electromagnetism. Detailed Answer Light's forward motion isn't propelled by a conventional force in the way we understand forces acting on massive objects. Instead, light's movement is intrinsic to its nature as an electromagnetic wave....