Light, in the form of electromagnetic radiation, does not fade or diminish over time as it travels through space. Once light is emitted from its source, it continues to propagate indefinitely unless it encounters an obstacle or is absorbed by a medium.
According to the principles of classical physics, light travels in straight lines and does not experience any loss of energy as it moves through a vacuum or empty space. This means that in theory, light can continue traveling forever without fading or getting weaker.
However, in practice, there are factors that can affect the apparent brightness or intensity of light over large distances. One factor is the expansion of the universe, which causes the wavelengths of light to stretch as space expands. This phenomenon is known as cosmological redshift, and it can make distant light sources appear more red and less bright when observed from Earth.
Another factor is the presence of interstellar and intergalactic dust and gas clouds. These clouds can scatter and absorb light, causing it to lose some of its energy and appear dimmer. This effect is more pronounced at longer wavelengths, such as in the infrared part of the spectrum.
So while light itself does not fade or weaken over time, various astrophysical phenomena and observational effects can make it appear less intense or alter its characteristics as it travels vast distances through space.