单词 | trifid nebula |
释义 | Trifid nebulaTrifid nebula(triff -id) (M20; NGC 6514) An emission nebula about 2000 parsecs away in the direction of Sagittarius. There is dark matter associated with the nebula.Trifid nebula[′trī‚fid ′neb·yə·lə] |
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