The speeding up effect can be explained in very simple terms. As we all know, looking further and further into space, we are looking at light that left the objects further and further back in time. A time that was that much closer to the big bang. Since we think the big bang is what started the universe, it would follow the same basic principles of a regular explosion. It would start out with objects flying outwards at extremely high velocities, but gradually slow down. People always ignorantly say, but there isn't air in space. Well obviously, but there is still gravity. And when you put gravity into effect of an explosion, the velocities of the objects involve with the explosion will gradually slow down as time passes. So the objects that are flying away from us at near the speed of light about 14 or so billion light years away were flying at that speed 14 billion or so years ago. That is definitely not their present speed. They'll have slowed down a whole lot by now.
Now if you were to apply this to things that are closer to us, and what do you get? Things now appear to be slowing down noticeably because they are that much closer to us, we see them closer to real time. We are close enough for the light from them to actually reach us and show us that they are slowing down. Dark Matter does not exist. And I doubt anyone at all can prove the existence of a God.
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