If you want to understand the fabric of the cosmos, you need to understand the language in which it is written - equations.
Light is energy that can take on many forms. Radio waves, microwaves, infrared, visible, ultraviolet, X-ray and gamma radiation are all different forms of light. (Illustration: NASA/CXC/M.Weiss)
Einstein's Theory of Relativity Explained (Infographic) - By Karl Tate, Infographics Artist