| 单词 | fg sagittae |
| 释义 | FG SagittaeFG SagittaeA rapidly evolving variable star in the constellation Sagitta that has recently cooled and expanded. It is now a pulsating yellow supergiant but in 1955 was a more compact hot blue supergiant. It is surrounded by a glowing expanding planetary nebula, and it is thought that as the nebula gradually disperses the central star will again heat up and contract before eventually becoming a white dwarf. |
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