counterglow
/ˈkaʊntərˌɡloʊ/
noun
- A faint glowing spot in the night sky opposite the sun, caused by sunlight reflecting off dust particles in the solar system.
- On a clear night, you can sometimes see the counterglow as a dim patch of light in the sky.
- The counterglow is also known as the gegenschein and is best seen away from city lights.
- Astronomers study the counterglow to learn about interplanetary dust.
Synonyms