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From dark energy and string theory to the end of the Universe, these are the unanswered cosmic conundra that are still baffling scientists.

From dark energy and string theory to the end of the Universe, these are the unanswered cosmic conundra that are still baffling scientists.

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The two largest pieces of the Universe that we know the least about, yet nothing less than the ultimate fate of the Universe will be determined by them. (Illustration: NASA/CXC/M.Weiss)

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WATCH: Why Scientists Say Dark Energy Could Have Just Disappeared

"The two largest pieces of the Universe that we know the least about, yet nothing less than the ultimate fate of the Universe will be determined by them."

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