Some thoughts on mass

F = (Gm₁m₂)/r², is the force of attraction between two bodies with masses m₁ and m₂ and r being the distance between them.

1. So when two bodies are brought sufficiently close together (such that r becomes very small), the force of attraction will be very large. This force will pull them closer. So masses does have a tendency to combine.
2. Two masses always attract each other. The universe is full of masses, but ever expanding why??

Law of gravitation