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Old 03-14-2018, 02:20 PM
 
Location: Mendocino, CA
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In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us. Isn't this logic a bit too simplistic and "linear"? It's like looking at prices keep rising and predict it must be 0 at some point.

And how can everything fit into one "singularity"? We know even an atom has a certain width.

I am atheist, by the way.
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Old 03-14-2018, 02:38 PM
 
Location: City-Data Forum
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Quote:
Originally Posted by rhbj03 View Post
In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us. Isn't this logic a bit too simplistic and "linear"? It's like looking at prices keep rising and predict it must be 0 at some point.

And how can everything fit into one "singularity"? We know even an atom has a certain width.

I am atheist, by the way.
Wish I knew more/better, But:

I think the singularity is based on the "Planck length" which is some quantum factor (found using math on our equations for the forces in our universe) which is supposed to represent a minimal length (so that there is no infinite regress in beginning a movement, I think).

The big bang model also predicted the cosmic microwave background, so that is another reason why it is currently favored, I believe.

The weird thing is that most protons/neutrons (since they can "decay" into other forms) are believed to be composed of "quark" particulates that I don't think have designated sizes yet, so they might not have a "specific size" at all.
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Old 03-14-2018, 03:14 PM
 
Location: Pacific 🌉 N, 🌄W
9,785 posts, read 4,095,375 times
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Quote:
Originally Posted by rhbj03 View Post
In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us.
The Universe expanding rests on the observation that everything is moving away from us.

The Cosmic Microwave Background supports the Big Bang.

I think this is a decent video explaining the Big Bang.


https://www.youtube.com/watch?v=G_MFhAoUUmQ&t=167s
Quote:
Originally Posted by rhbj03 View Post
Isn't this logic a bit too simplistic and "linear"?
Not when applied to explaining the fact that the Universe is expanding.
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Originally Posted by rhbj03 View Post
IAnd how can everything fit into one "singularity"?
We don't know but it's being worked out.
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Old 03-14-2018, 03:16 PM
 
20,231 posts, read 15,591,496 times
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Quote:
Originally Posted by rhbj03 View Post
In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us. Isn't this logic a bit too simplistic and "linear"? It's like looking at prices keep rising and predict it must be 0 at some point.

And how can everything fit into one "singularity"? We know even an atom has a certain width.

I am atheist, by the way.
There are actually two major reasons pointing to a so called 'big bang' origin of the Universe. One is the expansion of the Universe, and the other is the cosmic microwave background radiation (CMB) which can be detected throughout the Universe in every direction. The CMB is a relic of the 'big bang' and is the first light of the Universe. The wavelength of that first light is now stretched out so that it is in the microwave range of the light spectrum.

For a period of perhaps 380,000 years after the big bang the Universe was too hot to allow photons to travel freely because the photons were contained within a dense and opaque plasma of energy. Once the Universe cooled sufficiently the photons could travel freely in straight lines instead of bouncing around inside a thick soup of plasma. That is the first light that we now detect as the CMB.

When we look at a map of the CMB we are looking back in time to 380,000 years after the birth of the universe.

This is a map of the CMB.



https://en.wikipedia.org/wiki/Cosmic...ave_background

And yes, an expanding Universe does when you run it in reverse point to a smaller Universe in the past whether that ultimately points to a singularity or to a very small area such as planck length. According to string theory, the Universe at the beginning was at planck scale size.
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Old 03-14-2018, 03:31 PM
 
Location: Old Hippie Heaven
16,100 posts, read 7,044,687 times
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Quote:
Originally Posted by rhbj03 View Post
In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us. Isn't this logic a bit too simplistic and "linear"? It's like looking at prices keep rising and predict it must be 0 at some point.

And how can everything fit into one "singularity"? We know even an atom has a certain width.

I am atheist, by the way.
We're right out here on the edge of what is explainable within our ordinary frame of reference.

Can you accept that the evidence we have indicates an expanding universe?

There is physical, measurable evidence for which an expanding universe is currently the best explanation we have. That's about all you can say for sure.

As we speak, physicists are working steadily at answering your questions. They will find new evidence. They will find new explanations. But I know of no way to predict what that new evidence will be, nor what that new explanation might be.
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Old 03-15-2018, 09:19 AM
 
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Personally I am starting to believe Panspermia is the reason we are all here.
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Old 03-15-2018, 11:03 AM
 
1,203 posts, read 710,558 times
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Originally Posted by rstevens62 View Post
Personally I am starting to believe Panspermia is the reason we are all here.
As in "the aliens did it"?
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Old 03-15-2018, 01:51 PM
 
Location: Old Hippie Heaven
16,100 posts, read 7,044,687 times
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Quote:
Originally Posted by rstevens62 View Post
Personally I am starting to believe Panspermia is the reason we are all here.
It's possible.

But that doesn't have anything to with the Big Bang, and Panspermia just moves the question of how life began to another venue. It also doesn't answer the question of where we draw the line between life and non-life, or whether we think that said line is arbitrary.
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Old 03-15-2018, 02:48 PM
 
Location: Sierra Nevada Land, CA
7,876 posts, read 8,438,386 times
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Quote:
Originally Posted by rhbj03 View Post
In honor of Stephen Hawking - I am wondering how could everything form in one big bang?

My understanding is this theory primarily rests on the observation that everything is moving away from us. Isn't this logic a bit too simplistic and "linear"? It's like looking at prices keep rising and predict it must be 0 at some point.

And how can everything fit into one "singularity"? We know even an atom has a certain width.

I am atheist, by the way.
As a Christian I accept the Big Bang as true. I mean why not? In college I took a course in Astrophysics which neatly explained how all matter developed from photons-the particle aspect of light. The professor explained as things expanded and cooled down the photon particles started combining to form subatomic particles, which in turn combined to form atoms. Its been a few years since that course so I can't remember the details.

[Mod cut: off topic]

Last edited by elnina; 03-17-2018 at 05:28 PM..
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Old 03-15-2018, 03:12 PM
 
1,464 posts, read 579,638 times
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My theory is the big bang was not the start but the restart. At some point all matter should be sucked into black holes until all matter gets smaller and smaller. At some point it all gets so compressed it just explodes, which I think is a big bang. It makes sense that the big bang would just be part of an endless cycle, like everything else in nature.
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