At the heart of the Milky Way, just 27,000 light-years from Earth, there is a supermassive black hole with a mass of more ...
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The five biggest mysteries that define our universe
The universe contains roughly 2 trillion galaxies and countless mysteries, including dark matter, supermassive black holes, the nature of time, and the absence of observable aliens.
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The universe’s biggest structure that shouldn’t exist
The Hercules-Corona Borealis Great Wall stretches 10 billion light years, defying physics that suggest structures of that size should be impossible.
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