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re: Do you accept the notion of the Big Bang as the origin of our universe?
Posted on 1/5/18 at 12:13 pm to GurleyGirl
Posted on 1/5/18 at 12:13 pm to GurleyGirl
quote:
Obviously no one knows for sure but it's a logical deduction based the fact that 2 fundamental forces: gravity and expansion due to heat are known to exist and are basically polar opposites of each other. In other words I can easily see that the expanded universe eventually begins to contract again due to gravity and over billions of years once again concentrates into an infinite mass that at some point explodes again due to heat of expansion forming yet another expanding universe, etc.
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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Posted on 1/5/18 at 1:05 pm to Arksulli
quote:
Eventually the Universe will go through a Heat Death where all the stars are burned out and no new ones are being formed.
Well, maybe. The Second Law of Thermodynamics states that the state of entropy of the entire universe, as an isolated system, will always increase over time. This is why the deduction of a "death by ice" is popular at the moment.
We know, however, that there are circumstances at play that we don't understand at all and that they can have universal implications, pardon the pun. Dark Matter, and especially Dark Force, are the biggest factors in the evolution of the Universe. Together they make up 95% of the physical Universe.
I emphasized Dark Force because it seems to be variable. 5-6 billion years ago it grew strong enough to overcome the attractive force of gravity. That's one thought. Another is that it was gravity itself that changed. It became repulsive over long distances but remained attractive locally. We refer to the effect as "dark" because we don't know which is correct at this time.
Also, we don't know that the Universe is a closed system. There are indications that it might be linked to other Universes. M-Theory, Dark Flow and the Hole in the Universe are some of the proposals that support the idea that our Universe is intimately linked to others in a Multiverse.
This post was edited on 1/5/18 at 1:08 pm
Posted on 1/5/18 at 1:12 pm to Arksulli
quote:
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.
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
This post was edited on 1/5/18 at 1:13 pm
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