In the past, the structure of the Milky Way was thought of based on the distribution of stars around the Sun, but in the 1910s, the current scale of the Milky Way was discovered, and the group of stars to which the Sun belongs came to be called the Local System. Its properties have been studied statistically, and it does not have a clear structure, but can also be seen as a single open cluster. It is a disk system about 5,000 light years in diameter, 30,000 light years away from the center of the Milky Way. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
昔は太陽の周辺の恒星の分布から,銀河系の構造を考えていたが,1910年代に現在の銀河系のスケールが判明し,太陽が属する恒星集団を局部恒星系と呼ぶようになった。その性質は統計的に研究されており,明確な構造をもつものではなく,一つの散開星団とみることもできる。それは銀河系の中心から3万光年離れた,直径 5000光年程度の円盤系である。
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