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One thing about space that I didn't see mentioned in the article is that even in a complete vacuum billions of miles away from anywhere there is still inertia.
by narrator 9y ago
One thing about space that I didn't see mentioned in the article is that even in a complete vacuum billions of miles away from anywhere there is still inertia. If something spins around it will still experience centrifugal force, so this is an absolute property of space and the universe that isn't caused by interaction with another body.
- cyphar 9y agoThat's because rotation is a form of acceleration, and you can measure the acceleration (or if you prefer, the gravity) of a non-intertial (accelerating) reference frame. Galilean relativity only applies to inertial reference frames.