The Universe,Keeping to Move 動き続ける宇宙

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Aug 12, 2017 13:04 Universe earth
Once the earth was said to be immovable.
To make the earth as a target meant a immutable.
By seeing the universe, humanity tries changing past recognition.
I heard that the number of satellites currently found in the solar system exceeds 160.
Every one of them is repeating revolution and rotation around the planet.
That speed seems to be very fast.