Earth's ( Facts)

 Some important facts about Earth :

1. Earth is the third planet from the Sun in the solar system. It's names comes from the old English and Germanic words meaning " the ground".
2. There are a lot of different way to measure how long it take the earth to go around the sun but if you say it take Pi × 10 million second you will only be off by a half a percent.
3. The earth has the volume of about 1 trillion cubic kilometre.  Can you picture a cube 1000 metre high 1000 thousand deep, 1000 meters across? Now picture a trillion of them. That's the Earth.  Actually if you were that big, it would be easy.
4. The Earth has a mass of 6,000,000,000,000,000,000,000,000 kg, or if you prefer, 6 six tillion ton. In pounds , that's actually ...0. nothing. Mass is a measure of how hard gravity pulls on that mass. The Earth is in space, orbiting the Sun so it's in free fall . It has mass but no weight at all.
5. The Earth isn't a perfect sphere. It spins so it's a flattened at poles a little bit. The diameter through the poles is 13, 713.6 km ( 7882.4 miles ) but it's 12,756.2 km ( 7908.8 miles ) through the equator. That difference of 43 km is only about 0.3 percent though so really we're pretty close to a perfect sphere.
6. Not only is it flattened but the gravitational force of the ⛅sun and 🌒 Moon distort its shape even more pulling bulges out from it. The Earth is lumpy!out in the deep ocean  the bulges of water due to the ⛅ sun and the moon can have an amplitude ( change in height from maximum to minimum ) of about a meter ( 40 inches) . The solid Earth deforms due to the tides too with an amplitude of roughly 50 cm  ( 20 inches) . Even the air is affected by tides; though there are several factors that greatly complicate it. 
7. There is no physical place where Earth's atmosphere stops  and space begins the air just get thinner and thinner and eventually fades height above the Earth surface considered to be where space begin called the Karman line is at an altitude of 100 km. Anyone who gets higher than that is considered an astronaut.
8. The 🌒 Moon radius is about 1/4 that of the Earth's making it the largest satellite compared to its parent planet. Charon, Pluto  biggest moon is about half the diameter of Pluto itself .
9. The 🌒 Moon is farther away from the Earth than you think. As na analogy, if  the Earth were a basketball, the Moon would be the size of a tennis ball 7.4 meters ( 24 feet )  away.
10. The Earth atmosphere is only transparent to a narrow slice of the electromagnetic spectrum . What we call visible light gets through, but most flavour of infrared, ultraviolet, X rays and gamma rays are stopped cold. Those last few are dangerous to life as we know it, so that works out well.
11. The Earth is warming up. It's a fact.
12. Fewer than 200 impact craters have been cataloged on Earth . The Moon has billion. Old craters on the Earth are hundreds of millions of years olds; on the Moon those would be considered young.
13. An asteroid, 2010 TK7 shares an orbit with the Earth. It's about 300 meters ( 1000 feet ) across and never gets close enough to us to be a danger.

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