how can satellites and space ships stay orbiting around the Earth if our planet is moving at very high speeds across the universe?
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Imagine you shoot an arrow from the back of a moving train towards the front. Even if the train is moving very fast, the arrow would travel some distance. If there is no gravity and no air resistance, it’ll keep on going.
Now the train is going 100mph and arrow is going 50mph with respect to train. Someone standing on the station platform would see the arrow going at 150mph. This is relative speed based on the frame of reference of the observer.
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