# AST201H1 Lecture Notes - Lecture 12: Event Horizon, Rogue Planet, Equivalence Principle

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17 Sep 2016
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## Document Summary

Tutorial #2: the equivalence principle states that the effects of gravity are exactly equivalent to the effects of acceleration. Means that you can"t distinguish btw force of gravity or acceleration. When you are enclosed in a box on earth vs. acceleration through space enclosed: a satellite is orbiting earth. Newton said an object will move in constant speed and same direction unless acted on by an external force (this force was gravity) Einstein said the satellite is moving this way because of the curvature of spacetime. The curvature arises from the presence of masses. Explain why this is not actually a paradox. Both people will say the other person"s time is slower and that the other one is younger. It"s not a paradox bc one person has changed reference frame: a rogue planet, planet a, is 3 light years away. A spaceship travels from earth to planet a and back, the spaceship moves at.

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