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)

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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The possible outcomes to the fate of the Universe rest on the 95% of it we have currently no idea about: dark matter and dark energy

The possible outcomes to the fate of the Universe rest on the 95% of it we have currently no idea about: dark matter and dark energy

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I chose this because I want to be an astrophysicist someday or an astronomer who studies stars and galaxies in the universe and figures out how the universe began.

I chose this because I want to be an astrophysicist someday or an astronomer who studies stars and galaxies in the universe and figures out how the universe began.

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As for me, all the "dark" stuff is bullshit. I do NOT subscribe to these theories. It's all gravity, the forces of electromagnetism and nuclear reactions.

As for me, all the "dark" stuff is bullshit. I do NOT subscribe to these theories. It's all gravity, the forces of electromagnetism and nuclear reactions.

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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."

"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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