Question

Why all the planets do not collapse into sun instead of rotating around it?

Answer 1

Due to space time curve, the planets curve the space and float in space. They float because sun ( a very massive body) has curved the space ( when you put a heavy ball on a piece of cloth it gets down, same is the case for sun. When you will throw a light ball into that cloth, the 2nd ball will rotate in circular path around the 1st heavy ball). Same thing is happening with planets.