Apart from the as-yet-unobserved microscopic variety, physicists have spotted numerous telltale signs of black holes that weigh several times the mass of the sun.
除了至今尚未观察到的微型黑洞变体，物理学家已经发现了数倍于太阳质量的黑洞的明显特征。
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One telltale sign is that black holes are often marked by a compact cluster of stars that surround them, which were pulled from the dwarf galaxy when the black hole escaped.