I have a couple physics questions, so for those that know physics, - TopicsExpress

I have a couple physics questions, so for those that know physics, please help me out. I am specifically looking to Michael Costolo. Perhaps this is not your specialty and cant answer, but if you can I would appreciate it. (And these questions are not designed to elicit a theological response, they are purely curiosity on my part) Ok, heres my questions. Background: The Big Bang. It has been determined that the universe is expanding, and that galaxies farther out are actually moving faster than those closer to the center. So. First question: In an explosion, do particles farther from the center of the explosion move faster than those close to the center of the explosion? As an example, in a pipe bomb or hand grenade, the gunpowder (or other agent) used to cause the explosion also is propelled away from the center of the explosion. Will the gunpowder at the center of the explosion move slower than the powder farthest from the center? Second question: how can the farthest galaxies be accelerating? It is my understanding that this is not how matter behaves. In a vacuum, in order for an object to reach light speed, all that one needs is a continuous thrust. Doesnt matter if the engine is a 2.5 HP lawnmower engine, as long as thrust is continued, the object will accelerate (in that case its gonna take a LONG time, but eventually, you will reach light speed). Once the object reaches the desired speed, all one has to do is stop the thrust; the object, in a vacuum, will continue on pretty much indefinitely and forever at that speed, since there is virtually no friction. So. How can the farther galaxies be travelling at an ever increasing speed? Without an engine to continuing to boost them, how can that work? If I fire a rifle in space, that bullet will travel at that same speed virtually forever (assuming no interference). It would need continuous thrust to increase velocity. Thanks for the help, I am genuinely puzzled. And, please keep in mind that I am not a physicist...

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