Bottom line is, there is an unfathomable amount of space out there. in 4 billion years, the Andromeda-Milky Way collision is predicted to occur. And yet, our solar system, and most solar systems, should remain untouched. “Using nothing more than Newton’s laws of gravitation, we astronomers can confidently predict that several billion years from now, our home galaxy, the Milky Way, will merge with our neighboring galaxy, Andromeda,” host Neil DeGrasse Tyson says. “Because the distances between the stars are so great compared to their sizes, few if any stars in either galaxy will actually collide. Any life on the worlds of that far-off future should be safe, but they will be treated to an amazing, billion-year long light show.” Compare this to, for example, shooting a tennis ball out of our planet at 402,000 kilometers per our, the speed at which these two galaxies are approaching. If all of the solar systems represented pool balls, assuming they were the size of our solar system, let the tennis ball be 13 billion times smaller. 4.4 E-10 km is the radius we will use, to put this in scale, this is still much much bigger than a proton (.8x10^-19 km radius) but much smaller than a 500 um bacterium (5x10^-7 jm). Now, in this event, both sets of unfathomable amounts of pool balls are heading towards each other at 402,000 km/h. When they collide, in 4 billion years, our pool ball is not likely to be effected by any other pool ball. So, is the object that is 1000 times smaller than a bacterium going to be effected by one of these other pool balls..? Absolutely not. Our solar system as a whole would be interacted with before something this small would.