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There are many threads about this on this forum: People are confused about the basic idea of Gravitation in General Relativity. They understandably don't understand how the very common balls-on-rubber-sheet-analogy explains anything. I usually post those two links to help them:
http://www.physics.ucla.edu/demoweb..._and_general_relativity/curved_spacetime.html
http://www.relativitet.se/spacetime1.html
Now I made an animation based on those illustrations (watch in HD):
https://www.youtube.com/watch?v=izKLw1V7YJ8
http://www.physics.ucla.edu/demoweb..._and_general_relativity/curved_spacetime.html
http://www.relativitet.se/spacetime1.html
Now I made an animation based on those illustrations (watch in HD):
https://www.youtube.com/watch?v=izKLw1V7YJ8
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