2. The Name “Earth” Comes From Anglo-Saxons



Every other planet in our solar system is named after a Greek or Roman God, except our planet. The word Earth comes from the Anglo-Saxon word Erda, which means “ground” or “soil” and is thought to be 1,000 years old. Ironically, the planet is covered by 71% water -- the only planet we know of in the entire universe to have this precious fluid in liquid form.

4. Earth Is The Only Planet With Plate Tectonics



Scientists believe the Earth is made up of 7 major plates of “crust,” which move in different directions up to 4 inches per year. When they crash into each other, the theory goes, mountains are born; where they pull apart we have valleys. On the scary side these also cause earthquakes and volcanoes. The good news is that all this activity allows for carbon -- essential to our very existence -- to be recycled and replenished, allowing life as we know it to continue.

6. The Mysterious Moon's (Almost) Perfect Orbit



Speaking of the Moon (and that is its official name) one thing is for sure: it is NOT made of cheese. Aside from that, there are some things we don't know. For example, the lunar center is 6,000 feet closer to the Earth, which should cause its orbit to be more wobbly/erratic, yet it is almost perfectly circular. The Moon is covered in a dust that strangely smells like gunpowder, even though they are completely different materials. Also, while there is no “dark side” of the moon, the Earth's gravitational force has caused the Moon to stop rotating so that only one side faces us. In addition, it's quite an incredible coincidence that the Sun happens to be both 400 times bigger than the Moon and also 400 times farther away from Earth, making them appear the same size in the night sky.

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