にじゅうせい
二重星
1. double star; visual doubleAstronomy
2. Double starIn observational astronomy, a double star is a pair of stars that appear close to each other in the sky as seen from Earth when viewed through an optical telescope. This can happen either because the pair forms a binary star, i.e. a binary system of stars in mutual orbit, gravitationally bound to each other, or because it is an optical double, a chance alignment of two stars in the sky that lie at different distances.
Read “Double star” on English Wikipedia
Read “二重星” on Japanese Wikipedia
Read “Double star” on DBpedia
Read “Double star” on English Wikipedia
Read “二重星” on Japanese Wikipedia
Read “Double star” on DBpedia
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