The Earth (Sometimes known as Terra) is the planet we all live on. It is the most Conveniently Close Planet. It is the only planet TV Tropes exists on. All Tropers were born and live on Earth, unless we have someone currently on the International Space Station. There are over seven billion humans living on Earth. To learn more about Earth, all you have to do is go outside, but we don't blame you if you don't want to.
Earth is really weird when compared to the other planets. The first and most obvious difference is it is the only known place life exists. It is the most tectonically activenote planet in the Solar System (Io is more active, but it's a moon of Jupiter). It has the largest moon in comparison to its parent body's size in the solar system. Earth is the only planet with vast oceans of liquid water on the surface.
The human race evolved on Earth OR arrived there at some point in the past OR was placed here by The Powers That Be. It took us a while to realize that we were on a planet, and not the center of the universe. It took us a bit to realize it was round, not flat, that it spun around on its own, and that it went around the Sun not the other way around.
The Earth is the standard we use to measure the universe with. The atmospheric pressure and gravity are considered "1" when compared to other planets, which are either higher or lower than that number. We call dirt "earth", even when talking about the dirt on other planets.note Our moon is called simply the "Moon"note . We measure the distances around the solar system in "Astronomical Units" (AU) the distance from the Sun to the Earth.