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Unit 7: Astrophysics Page 12

follow the straightest possible paths in curved spacetime. This is the essence

of general relativity’s description of gravity.
Spacetime interval: A four-dimensional “distance” in spacetime. Unlike
intervals of time or distance, which are different for observers in relative
motion, the spacetime interval between two events has the same value for

all observers.
Special theory of relativity: Einstein’s statement that the laws of physics

are the same for all observers in uniform motion.

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