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Unformatted text preview: One consequence of this principle is that space-time in the presence of matter is curved. (Space-time is the four-dimensional continuum of time and space in which any event or physical object is located.) This can be understood by imagining a spaceship accelerating upward through space. If a light ray enters the ship through a window, a person inside the ship will see the light ray bend downward, because by the time the light reaches the other wall of the spaceship, that wall will have accelerated upward; thus the ray of light enters through the window at one height, and hits the opposite wall at a height closer to the floor of the space ship. Yet because nothing can travel faster than light, we know that light must always travel the shortest distance between two points; and since the shortest distance between two points in an accelerating spaceship...
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This note was uploaded on 12/14/2011 for the course BIO 1320 taught by Professor Staff during the Fall '09 term at Texas State.
- Fall '09