This post is a combination of science, philosophy, and music:
Every bit of matter and energy in the universe is moving through time and space at its own velocity and trajectory. That means that th infinite number of those makes it certain that each of those will come into contact with an almost infinite numbers. That makes it impossible to predict which will contact with which, or at what time and point in space (Heisenberg uncertainty principle). Some of those contacts will be at great force, releasing very large amounts of energy and altering the matter involved. Others will be a gentle merging in which it is most difficult to note quickly that a change has occurred.
Each contact is an moment which is both the ending event in one sequence and the beginning event in the It is a bride between what was and what results. So, in that sense, here are no beginnings or ends to anything in the universe.
Either consciously or by instinct Igor Stravinsky realized this. In his music, every ending note of each sequence is the beginning note of the next. There are no beginnings or ends, merely transitions. Some of those transitions are powerful and discordant. Others are so gentle and beautifully in harmony that we hardly notice the change. This is to me one of the mysteries and beauty of Stravinsky's work.
Although we may not know precise locations, that was the point in my college course at which probabilities of finding a position of matter were introduced, and at that point my mathematical abilities got off the bus, so I cannot help much. I just like the idea of no beginning and no end. I am sure that it annoys religionists. Would you march round with a banner which said
" THE WHOLE HISTORY OF THE WORLD IS KINDA GOING TO COME ROUND AGAIN." ?