re: Do you accept the notion of the Big Bang as the origin of our universe?

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That is an interesting idea, and one I tend to lean towards as well. Eventually the Universe will go through a Heat Death where all the stars are burned out and no new ones are being formed. With no heat being generated gravity slowly causing the Universe to contract until we get another Big Bang.

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I do believe a heat death is the ultimate fate, I encourage you to watch the second video (called The End) I posted on the first page if you want to learn more about it. He goes over our theories on the end of the universe and how/why we think that.

What’s interesting is the lifespan of Red Dwarf stars - 10 trillion years! Our universe is only 14 billion years old, these things are expected to burn far far longer than that. So while a heat death may be the ultimate fate it won’t happen for a very long time.

Red Dwarf star