A Galaxy, plural: galaxies, is a collective structure of anything it's gravitational core can pull in. In all-but-some cases, a Galaxy contains orbitting bodies that circle the galaxy. Their not actually circling, their spiraling inward at an unnoticeable rate. Usually, half of a galaxy's orbitting bodies are Stars, and about a tenth of those star systems have planets, and about a thousanth of those Solar System contain 1 carbon dioxide-habitable planet.

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