My questions about the Big Bang.

I’m trying to learn about the Big Bang for my study of the KCA.  Here’s what I’m wondering.

The universe is expanding, so if we just extrapolate back, everything goes back to a point called a “singlularity” (apparently some are skeptical of the singlularity, but I won’t get into that now).  However, all I can conclude from this is that the singularity was there and it suddenly expanded.  What justifies me in saying the universe came into being, which brings up images in my mind of the singularity appearing from nothing and expanding, instead of just saying it’s always been there?

With our current theories, we can’t know much about the Planck era, the first 10−43 second of the universes expansion. So how do we know how long it is, and how can we say there was a singularity or that everything came from nothing when we currently don’t know much about this period of the universe?

I’d appreciate the help.  I’d also like to know any good resources on this topic.

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One Response to My questions about the Big Bang.

  1. Sam Harper says:

    There are a couple of problems with the idea of the universe having always existed, maybe in the form of something as small as a planck length.

    First, it’s because matter and energy are in a constant state of change. This is even true in string theory where the smallest things are tiny strings. If something is in a state of change, then time must exist. So if anything physical exists without a beginning, then time must also be without a beginning. But the kalam cosmological argument includes two philosophical arguments for a beginning of time, so it’s not possible for anything physical to have always existed without a beginning. If there is anything that has always existed without a beginning, it has to be something that is capable of existing in a state of timelessness.

    Second, it’s because if the universe has always existed as a tiny object before expanding, then all of the necessary and sufficient conditions for it to begin to expand have always been there as well, which means it could not have existed for an infinite amount of time without expanding. If the universe existed as a tiny object for an infinite amount of time, then there would be nothing to cause it to begin to expand since nothing exists outside of it. Of course you could say, “Well, God could’ve caused it to begin to expand,” but that’s no way to refute an argument for God!

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