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为什么宇宙布满星星,却还是那么黑?
如果你等得足够久,最终所有的恒星都会燃烧殆尽——像太阳这样的恒星只能持续大约100亿年。据天文学家假设,在遥远的未来——从现在开始的一千万亿年后——宇宙将变得黑暗,只剩下像白矮星和黑洞这样的恒星残骸。
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