Dark Matter has been observed for decades throughout the universe as mysterious clouds of invisible material between the stars and surrounding entire galaxies. While it can't be seen it does have mass, so it exerts a gravitational pull that affects the movement of stars, and it can bend light through an effect called gravitational lensing.
Astronomers estimate that Dark Matter makes up about a quarter of all the mass in the universe. They call it dark because they don't know what it is. They do suspect that it's made of different stuff than we are. And while we can't see Dark Matter, it doesn't see us either.
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