Nonluminous matter not directly detectable by astronomers, hypothesized to exist because the mass of the visible matter in the universe cannot account for observed gravitational effects.

 
  • 不發(fā)光的物質(zhì),天文學(xué)家無(wú)法直接發(fā)現,由于宇宙可見(jiàn)物質(zhì)的質(zhì)量無(wú)法解釋觀(guān)測到的重力效應而假設其存在。
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