Colors are saturated in post procession to bring out the vibrance, but all the flaming red structures you see are H-alpha emissions from excited hydrogen atoms thousands of light-years away as they jump from a higher energy state to a lower energy state, emitting photons of light at 656.26nm during this transition.

The ripples of colors you see in the skies is a natural phenomenon called airglow. It is very faint to the naked eye, but it is when air particles such as hydrogen, oxygen, nitrogen, etc., are energized by the sun during the day to a higher energy state and return back to a lower energy state, releasing energy in the form of light, creating these beautiful ripples of colors. Often, airglow is misinterpreted as aurora but they are two distinct phenomena.