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black hole noun

  /blæk ˈhoʊl/ , /blæk ˈhəʊl/
  • (astronomy) A gravitationally domineering celestial body with an event horizon from which even light cannot escape; the most dense material in the universe, condensed into a singularity, usually formed by a collapsing massive star. [from 20th c.]
 黑洞
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