Astronomers have discovered a massive galaxy made almost entirely of dark matter. Called Dragonfly 44, the galaxy is basically 99.99 percent dark matter.

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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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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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