21 million light years
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Messier 101 (M101) is a galaxy located around 21 million light-years away from Earth.
The average distance from the surface of the Earth to the center is about 6,371 kilometers (3,959 miles).
Thuban is a star located approximately 303 light years away from Earth in the constellation of Draco.
The Scorpius constellation is approximately 400-500 light-years away from Earth.
The mesosphere is the layer of Earth's atmosphere located about 31 to 53 miles (50 to 85 kilometers) above the Earth's surface.
From the Earth's crust to the inner core is about 3,950 miles.