Things You Thought You Knew – Where the Sun Don’t Shine
StarTalk Radio
The Gravitational Field in a Rocket
If you turn on your rocket engines anywhere in space, when you were otherwise just coasting, you will have what is effectively a gravitational field inside your rocket. So Einstein figured out that if you're in a rocket, you cannot know the difference between the rocket accelerating through space and whether the rocket is sitting there on Earth. Because the rocket is creating an artificial gravity. By having the acceleration.
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