nightglow
/ˈnaɪtˌɡloʊ/
noun
- A faint light visible in the night sky, caused by chemical reactions in the upper atmosphere.
- Astronomers have to account for nightglow when taking long-exposure photographs.
- The nightglow gave the sky a soft greenish tint even without moonlight.
- From the mountaintop, we could see the beautiful nightglow above the horizon.
Synonyms