and that this is one in a cycle of the universe expanding from the singularity and then contracting back to it again?
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Stephen Hawking proved that our universe is not the result of a previous universe contracting.
There are many well-respected physicists, such as Stephen Hawking, Lawrence Krauss, Sean M. Carroll, Victor Stenger, Michio Kaku, Alan Guth, Alex Vilenkin, Robert A.J. Matthews, and Nobel laureate Frank Wilczek, who have created scientific models where the Big Bang and thus the entire universe could arise from nothing but a quantum vacuum fluctuation -- via natural processes.
In relativity, gravity is negative energy and matter is positive energy. Because the two seem to be equal in absolute total value, our observable universe appears balanced to the sum of zero. Our universe could thus have come into existence without violating conservation of mass and energy — with the matter of the universe condensing out of the positive energy as the universe cooled, and gravity created from the negative energy. When energy condenses into matter, equal parts of matter and antimatter are created — which annihilate each other to form energy. However there appears to be a slight imbalance to the process, which results in matter dominating over antimatter.
I know that this doesn't make sense in our Newtonian experience, but it does in the realm of quantum mechanics and relativity. As Nobel laureate physicist Richard Feynman wrote, "The theory of quantum electrodynamics describes nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept nature as she is — absurd."
For more, watch the video at the 1st link - "A Universe From Nothing" by Lawrence Krauss.
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There are many well-respected physicists, such as Stephen Hawking, Lawrence Krauss, Sean M. Carroll, Victor Stenger, Michio Kaku, Alan Guth, Alex Vilenkin, Robert A.J. Matthews, and Nobel laureate Frank Wilczek, who have created scientific models where the Big Bang and thus the entire universe could arise from nothing but a quantum vacuum fluctuation -- via natural processes.
In relativity, gravity is negative energy and matter is positive energy. Because the two seem to be equal in absolute total value, our observable universe appears balanced to the sum of zero. Our universe could thus have come into existence without violating conservation of mass and energy — with the matter of the universe condensing out of the positive energy as the universe cooled, and gravity created from the negative energy. When energy condenses into matter, equal parts of matter and antimatter are created — which annihilate each other to form energy. However there appears to be a slight imbalance to the process, which results in matter dominating over antimatter.
I know that this doesn't make sense in our Newtonian experience, but it does in the realm of quantum mechanics and relativity. As Nobel laureate physicist Richard Feynman wrote, "The theory of quantum electrodynamics describes nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept nature as she is — absurd."
For more, watch the video at the 1st link - "A Universe From Nothing" by Lawrence Krauss.
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There is no evidence to support this. We can say that the Big Crunch (and by extension, the Big Bounce) won't happen in the future, based on the expansion rate of the universe and the estimated mass of the universe and estimated value of Dark Energy. But we cannot investigate anything prior to the Big Bang, everything we can observer about the past, has a look-back 'shelf life' dating back to after the universe was already in a state of expansion.
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Hi. Probably not, although there are serious theories that propose the existence of multi-universes. If these exist then each may have a big bang and a different set of physical principles.
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i learn that there is big bang happening through the galaxy
there is a big bang that formed our world/universe and there is other big bangs forming in other parts of the galaxy
there is a big bang that formed our world/universe and there is other big bangs forming in other parts of the galaxy
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That's highly possible. The universe expands then comes back in. And then theoretically it repeats. So it wouldn't be all that weird if this isn't the first big bang
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Can't say, its all hypothesis.