環 (天体)
1. Planetary ringA planetary ring is a ring of cosmic dust and other small particles orbiting around a planet in a flat disc-shaped region. The most notable planetary rings known in Earth's solar system are those around Saturn, but the other three gas giants of the solar system possess ring systems of their own. Reports in March 2008 have suggested that the Saturnian moon Rhea may have its own tenuous ring system, which would make it the only moon known to possess a ring system.
Read “Planetary ring” on English Wikipedia
Read “環 (天体)” on Japanese Wikipedia
Read “Planetary ring” on DBpedia
Read “Planetary ring” on English Wikipedia
Read “環 (天体)” on Japanese Wikipedia
Read “Planetary ring” on DBpedia
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