The True Science of Parallel Universes Everyone loves the idea of parallel universes - maybe it's the appeal of an ideal world where you have second chances and things turn out differently - an alternate reality where you do get into Hogwarts and the Star Wars prequel aren't made and you finally plug in your asymmetric computer cord correctly on the first try... but is there really a place in science for such wistful speculation? 大家都喜欢平行宇宙这种见解，在这里你有第二次机会且一切都将不同， 这个概念也许是这种理想世界的吸引力。在另个现实中，你可以成为霍格华兹 的魔法学徒，也可以在没有星战前传三部曲的美好地方，还可以把你的电脑插头 一次插好。但对於这种美好幻想，科学上真的存在这种地方吗? (请问从霍格华兹开始那一段还可以翻成怎样，有什麽更好的翻法吗?) I mean, if "the universe" is everything that there is, you can't have two versions of it, right? Otherwise the pair would really be everything and what you started off calling the universe, wasn't. The problem here is terminology: physicists speaking informally often say "Unvierse" when they really mean "observable universe" - that is, the part of the whole universe that we've so far been able to see. And it's perfectly fine to talk about multiple different observable universes - for example, an alien near the edge of OUR observable universe will see parts of the Whole Universe that we cannot yet see, because the light doesn't have the time to reach us yet, but that's a well-understood question and not what physicists normally talk about when they discuss multiple observable universes, or "multi-verses". 我说的是，如果"宇宙"代表所有的事物，宇宙就不会有两种版本，对吧? 否则这两种版本的宇宙共同代表一切的话，那你一开始说的那个宇宙就不是了。 这其实是术语上的问题: 物理学家泛指的"宇宙"实际上是指可观测宇宙。 也就是说，整个宇宙到目前为止我们所能看见的部分。当然要讨论若干不同的 可观测宇宙是绝对没问题的。例如，处於我们所知宇宙边缘附近的外星人， 牠们可以看到整个宇宙里我们还没办法看见的部分，因为从那发出的光还没到 我们这里。这是个无疑义的问题，但当物理学家讨论到多个可观测宇宙或"多重宇宙"时， 这不是他们所讨论的东西。 (这次有尽量翻的通顺点，但有什麽问题也请多指教，谢谢~) 忘了附连结... https://www.youtube.com/watch?v=KNwKPfOKipk --

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