暗物質
暗物質（dark matter）係一種物質，似乎組成宇宙當中 85% 嘅物質以及大約 25% 嘅總能量密度。暗物質唔會發光，所以冇得直接探測，但呢啲物質嘅重力等效應會影響探測得到嘅天體，所以人類可以間接觀察呢啲物質。
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