Astronomers with the Event Horizon Telescope have developed a new way to observe the radio sky at multiple frequencies, and it means we will soon be able to capture color images of supermassive black holes.
Color is an interesting thing. In physics, we can say the color of light is defined by its frequency or wavelength. The longer the wavelength, or the lower the frequency, the more toward the red end of the spectrum light is. Move toward the blue end, and the wavelengths get shorter and the frequencies higher. Each frequency or wavelength has its own unique color.
