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I've been hearing a lot about how dark energy is moving the galaxies away from each other. How can something be so powerful as to move whole galaxies yet not tear apart the galaxies themselves? Not even picking away at the small planets on the fringe of each galaxy. Why? What's protecting them?
A question was raised as to why the sky gets dark at night when there are so many galaxies with trillions of stars shooting light our way. The answer given was that the universe is expanding, so a lot of the galaxies are moving at a rate that prevents their light from reaching us. My question is: How can galaxies move even close to the speed of light?
Originally posted by lernmore
I created a thread a while back looking for a discussion on dark energy, but it turned into a philosophical slap fest, and it quickly got passed by without a single reply about the actual physics.
Are we Space Itself?