For example, even though we don’t see x-rays, they still exist. We know this because we as human beings have the ability to create x-rays, and we can also measure them. In fact, an infinite number of frequencies exists within the spectrum of x-ray light. X-rays are a faster frequency than the visible light we see and therefore have more energy (because, again, the faster a frequency is, the higher its energy). Matter by itself is the densest of frequencies because it’s the slowest and the most condensed form of light and information.
