I am wondering about the journey of a comet: 1. Lets say this comet is located in the Kuiper Belt. From my understanding it is inert. Trying to tie in my limited Relativity understanding, could I say that it is in free float? From my understanding, it is getting its movement orders from the spacetime where it is located. 2. What exactly makes them get pulled towards the sun? It seems random. 3. Again, trying to tie in my limited Relativity understanding after some event, our comet will start heading for the sun. Could I say that it is now receiving its movement orders from the Sun? I also understand that Jupiter can come into play during this time, due to its gravity. 4. If our Comet passes the Sun, what is next? Where does it get its marching orders from? Also, do we know the curvature of spacetime in our Solar System? Sorry if these concepts are not at all relevant, just trying to tie together some of the things I am reading now. Many thanks for all wisdom.