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Q: In relativity, length contracts at high speeds. But what’s contracting? Is it distance or space or is there even a difference?
A spaceship leaves Earth and heads to a star 4 light years away at 80% of light speed. If you’re wondering, the spacetime interval is a direct consequence of rule #1 in relativity: the speed of light is the same to everyone. There are two things to notice about the spacetime interval. is that the spacetime interval is really easy to work with. Like regular distance, the power of the spacetime interval is that it is the same from all perspectives.
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