Most of the universe is missing
Unexplainable
00:00
Dark Matter - The Idea of Dark Matter
There's this invisible mass, what astronomers call dark matter. Hanging out at the edge of these galaxies, tugging those stars along. To move this many stars, there would need to be a staggering amount of dark matter. More than all the rest of the normal matter in the universe combined. What is this stuff? No idea.
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