OK, Although I think my theory is no good, lets go with galaxies are held in place by orbital dynamics. If orbital dynamics include the bending of space, this can cause the galaxies to collide. Einstein's theory says to stretch fabric out tightly, place a bowling ball in the middle, place a marble at the edge of the fabric, and the marble rolls toward the bowling ball because the fabric is pushing on it, not because of the gravitational pull of the bowling ball. The smaller galaxies would eventually collide with the larger galaxies for the same reason. The moon will collide with the earth, the earth with the sun. It would all work the same. This may be why the stars are not moving farther apart with the expansion of the universe. I don't know, I am just running with the ball. Most likely in the wrong direction.
Nope. Every part of the universe is moving away from every other part as space-time itself expands. It's often described as raisins moving away from each other in a rising loaf of bread, the raisins representing galaxies and other such objects in space.
Oops! Didn't catch the part until later. :)
Oops! Didn't catch that part until later. :)
This is not good because the Milky Way would have to be the biggest galaxy.
Stars inside galaxies maintain their distance from each other by being in common rotation around a central core.
But the distance between galaxies is increasing. That’s what “expanding universe” means.
The distance between earth and other stars in our galaxy isn’t increasing, but the distance between our galaxy and all other galaxies is increasing.
And, it’s increasing at an increasing rate.
The rate of expansion is getting bigger.
The expansion not only shows no signs of slowing down, but seems instead to be speeding up.
It seems to any observer in any galaxy that his galaxy is “at the center of the universe” because the expanding universe is not like the expansion of an exploding powder keg but rather the expansion of space itself.