Part 4/8:
The significance of light extends beyond visibility; it is fundamentally tied to the electromagnetic forces that shape the universe. In 1865, James Clerk Maxwell formulated the laws of electromagnetism, demonstrating that light is an electromagnetic wave whose speed is defined by the properties of empty space. Einstein later utilized these concepts in his theory of relativity, postulating that the speed of light is constant across all reference frames—a cornerstone of modern physics.
Moreover, light acts as a mechanism for energy transfer. For instance, the Sun generates light through nuclear fusion, merging hydrogen atoms into helium in its core, releasing tremendous amounts of energy in the form of gamma rays, which are eventually converted into visible light as they surface.