top 10 facts

 



1 Earth is the third planet from the sun and the only known planet with living organisms.
2 The universe is estimated to be about 13.8 billion years old.
3 The fastest land animal is the cheetah, which can run up to speeds of 70 miles per hour.
4 The human brain contains about 100 billion neurons.
5 The Great Barrier Reef is the largest coral reef system in the world, stretching over 1,400 miles off     the coast of Australia.
6 The tallest mountain in the world, measured from base to summit, is Mauna Kea in Hawaii, which 8      rises 33,465 feet (10,205 meters) above sea level.
7 The largest known star, UY Scuti, is over 1,700 times larger than the sun.
8 The Earth's atmosphere is composed of 78% nitrogen, 21% oxygen, and 1% other gases.
9 The human body is made up of approximately 60% water.
10 The speed of light is approximately 299,792,458 meters per second.

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