The red color we see on a lot of photographs of nebulae comes from which element?

Question

Quizplus · Accepted Answer

The red color in photographs of nebulae typically comes from the emission of hydrogen gas. This emission occurs when electrons in the gas become excited and then transition back down to their original energy state, releasing energy in the form of light. This particular transition corresponds to a wavelength of light that appears red to our eyes.

The Red Color We See on a Lot of Photographs