gegenschein
/ˈɡeɪɡənˌʃaɪn/
noun
- A faint, diffuse oval patch of light in the night sky, located opposite the sun, caused by sunlight reflecting off interplanetary dust particles.
- Astronomers study the gegenschein to learn about dust in the solar system.
- The gegenschein is best seen when the moon is not in the sky.
- Under very dark skies, you might spot the gegenschein as a faint glow near the Milky Way.
Synonyms