• Sky glow is a natural, faint illumination of the night sky, distinct from light pollution, and it's expected to be visible over the Midwest tonight.
• Natural airglow, a type of sky glow, is caused by chemical reactions high in the atmosphere, creating a subtle, widespread light.
• To see sky glow, find a dark spot away from city lights in the Midwest, allow your eyes to adjust, and look for a faint, diffuse light on the horizon.