So I'm new here, hopefully I'll post a lot more in the future. Anywho, not sure if this is the right place but I've been wondering about what would happen under a given scenario. Say that you have two large objects of mass such as 2 stars a substantial distance x away from eachother. Take them initially at a state of rest and in a closed system. If you release them and allow them to freely accelerate to one another their speeds will continually increase from a neutral observant point. So, what happens if the objects are large enough and far enough away that they accelerate to the speed of light. I don't know what is stopping them from going faster, theoretically as they get closer the force attracting them should only increase and it's not like the force goes away as they get closer.