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# Lein's prezi

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## maryann carroll

on 9 June 2016

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#### Transcript of Lein's prezi

Newton thought that only objects with mass could produce a gravitational force . According to Newton’s theory, the force of gravity should not affect light. however, this is not true
Einstein's theory
Einstein discovered that the situation is a bit more complicated .
First he discovered that gravity is produced by a curved space-time. Then Einstein theorized that the mass of an object actually curves space-time. Mass is linked to space in a way that physicists today still do not completely understand. However, we do know that the stronger the gravitational field of an object, the more the space around the object is warped. In other words, straight lines are no longer straight if exposed to a strong gravitational field; instead, they curve.

so,
Since human brains are not good at picturing things in 4 dimensions we usually resort to an analogy in 3 dimensions. Imagine spacetime as a sheet of rubber, stretched flat when there is no matter present. If we place a massive object like a star on this "space" it pushes down into the rubber sheet creating a pit in the rubber. an asteroid flying by the star would not travel in a straight line as it rolled along the sheet, it would curve as it went through the dip, coming out in a new direction. If an object were going just the right speed, it might get stuck in the pit and travel around the star in orbit So far the predictions of this theory are the same as Newton's, but now comes a big difference- if light traveled along this rubber sheet of space time, it would follow the curve too, since the curvature of space is already created by the star. In fact if the pit is deep enough and the walls very steep, the light might fall into the pit and never escape. (a black hole) Newton didn't notice this bending of light because it takes extremly massive objects to get something as fast as light to curve enough that you can notice.
how is light affected by gravity?
pictures
Newton's theory
wrapping it up
bibliography
https://van.physics.illinois.edu/qa/listing.php?id=2010