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Kuiper belt

Astronomical discovery
The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times as wide and 20–200... Wikipedia
Discovered: 1992
Discoverers: David C. Jewitt and Jane Luu
Surface temperature: about 50 Kelvin