Hi, I'm only 14 years old so excuse any spelling. I personally think gravity is caused by heat, not spinning. First off, The sun is holding the galaxie together because the planets are moving forward and the sun is bringing us into them with its gravitational pull, the sun is extremely hot and it has a pull. Second off, Earth is spinning(which some people think gravity is caused by) but we have a core that also contains extreme heat, we are pulled into it. If gravity was caused by spinning the people on the sides of the earth wouldnt stay. Third off, Space is extremely cold and it has less gravity. Forth off, A spaceship was flying away from the sun and all of the sudden they had a speed decrease, eventually when they had gotten far enough away from it their speed had gone back to normal. This is just some evidence i thought of while in the car so i will keep posting if i can think of anything else.
