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Galaxy
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Galactic rotation curves describe the rotational velocities of stars and gas within galaxies.
The Milky Way galaxy has a diameter of tens of thousands of parsecs.
Galaxies billions of parsecs away are visible with powerful telescopes.
The macrocosm holds wonders beyond imagination, from distant galaxies to enigmatic black holes.
Some astronomers study intergalactic space, the vast regions between galaxies.
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