In the context of outer space, the perception of blackness or darkness is indeed related to the absence of visible light reaching our eyes. Space is not completely empty, as it contains various forms of energy, particles, and fields. However, the density of these particles is extremely low compared to what we encounter on Earth or within our atmosphere.
In space, there are vast distances between objects, and the density of matter, including massive particles, is significantly lower than what we experience on Earth. As a result, the likelihood of light interacting with particles and being scattered or absorbed is significantly reduced.
On Earth, we perceive objects and our surroundings as visible because light interacts with the atoms and molecules present in our environment. When light encounters matter, it can be reflected, absorbed, or refracted, allowing us to perceive its presence and see the objects around us.
In space, since the density of matter is low, there are fewer particles for light to interact with. As a result, light often travels through space undisturbed until it encounters an object, such as a planet, star, or dust cloud, where it can be scattered or absorbed. This limited interaction with matter in space contributes to the perception of darkness or blackness.
It's important to note that while space appears dark to our eyes, it is not entirely devoid of electromagnetic radiation. There are various wavelengths of light and other forms of energy present in space, such as radio waves, X-rays, and cosmic background radiation. However, our eyes are specifically adapted to perceive visible light, which is why we perceive space as predominantly dark when we look at it directly.