Earth
Much can be said about Earth. It is a rocky planet with an atmosphere, the third planet of the Sol system. Most importantly though, it is the original home of humanity. Though there have been human populations on other planets for over a century, it still harbors more than half the entire population. Earth has one moon, Luna.
Geography
71% of Earth's surface is covered in water. The land area is divided into several continents, all but one of which have large human populations.
Ecosystem
Earth is the only planet known to harbor multicellular life. Billions of species of organisms form an extremely complex, planet-wide ecosystem. Even now, biologists discover new species every week.
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