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#1
This thread, although I'm not going to title it "The ONLY Astronomy Thread" is for all things related to Astronomy, Cosmology, etc.

Please feel free to ask questions about things like the Big Bang, String Theory, Galaxies, Super Nova's, General Relativity, Determinism, Quantum Mechanics, Time, etc.

Also, posting pictures is okay. I'm going to ask that you don't post image tags around the pictures, and just post the links, with notification that they're images. I ask this for two reasons:

1. Images of space are often times f*cking huge.

2. If people are having discussions, scrolling through the pictures will be annoying.

I'll start with some images:

http://apod.nasa.gov/apod/image/0602/eagle_kp09_big.jpg

http://icehome.in.cnr.it/icefalls/Astro/Nebulae/HH%20wf%20temp%201200%20us.jpg

Here are some questions I've heard, both on and off the internet that are good starters for you to think about.

Will the fate of our universe lead to the Big Crunch?

Does dark matter and dark energy exist?

Does God play dice (according to Einstein, he doesn't, poetically speaking)?

Do black holes exist?

Does there need to be a singularity for the big bang to occur?

Well, I hope this thread becomes successful, not only because I like when my threads become successful, but I might learn a few things here.

Post away.
#2
lolnosmartthingsinthepit.

But have people actually seen a black hole? Or is it all just theory?
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#3
Quote by Is_6_9?
lolnosmartthingsinthepit.

But have people actually seen a black hole? Or is it all just theory?
I don't think we've observed one, but I think it's likely they exist. I believe they do.
#4
Anyone ever wanted to go to the moon? Speaking of which how many years till Mars? It would be amazing to have series of missions trying to get to Mars.

Edit: NASA's 50th Anniversary I believe, missed that Discovery special at nine though so i'm pissed. Hopefully there will be an encore at midnight.
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#5
Quote by The Madcap
I don't think we've observed one, but I think it's likely they exist. I believe they do.

Haven't they observed evidence that indicates a black hole? I thought I saw that somewhere.
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#6
I don't think we've observed one, but I think it's likely they exist. I believe they do.

IIRC, due to the nature of black holes, they're invisible. However, astronomers are able to see their gravitational pull on the objects around them.

edit: Beaten to it
#7
Quote by Is_6_9?
lolnosmartthingsinthepit.

But have people actually seen a black hole? Or is it all just theory?


I would imagine astronomers have seen one, because otherwise how would they know blackholes exist?
#8
Quote by Flyaway
I would imagine astronomers have seen one, because otherwise how would they know blackholes exist?
Speculation. We've seen stars so massive, it's not hard to believe that there are stars that are so massive that their gravitational pull is strong enough to pull the light it emits, which is how a black hole forms.

There are other ways, to, but I'm don't know a whole lot about this.
#9
I your threads Madcap, I will be reading most posts on this thread. I'm offski for now though.

*subscribes*

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#10
Quote by The Madcap
Speculation. We've seen stars so massive, it's not hard to believe that there are stars that are so massive that their gravitational pull is strong enough to pull the light it emits, which is how a black hole forms.

There are other ways, to, but I'm don't know a whole lot about this.



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I your threads Madcap, I will be reading most posts on this thread. I'm offski for now though.

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I'm subscribing too, thank you for starting this thread Madcap
#12
Roswell Was A Cover Up!!!!!

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#13
Quote by InvaderTSN
What is "the Big Crunch"?
Basically, it states that our universe will eventually stop expanding, and then gravity will bring all matter back together until it's very dense, etc.

With our current evidence, it's not very likely that will happen. It looks like judging from how we're expanding, gravity isn't strong enough to do that. Even if dark matter exists, it's still not likely, however we still don't know everything about our universe, so scientists aren't going to it's impossible.
#15
Quote by The Madcap
Basically, it states that our universe will eventually stop expanding, and then gravity will bring all matter back together until it's very dense, etc.

With our current evidence, it's not very likely that will happen. It looks like judging from how we're expanding, gravity isn't strong enough to do that. Even if dark matter exists, it's still not likely, however we still don't know everything about our universe, so scientists aren't going to it's impossible.


So it's saying that it will go back to what it was like before the Big Bang and so forth?
#16
Yeah, they're artificially colored. If you image search "cat eye nebula" on Google, about 4 or 5 differently colored images show up. I was kind of disapointed when I found that out, but they're still amazing even in black and white.
#17
Quote by InvaderTSN
So it's saying that it will go back to what it was like before the Big Bang and so forth?
Yeah, I've heard some people say that from the Big Crunch (assuming it's true), another Big Bang will occur, but I still find the Big Crunch unlikely.
#18
Anyone care to shed some light on the "Universe is shaped like a donut" theory?
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#19
Quote by The Madcap
Yeah, I've heard some people say that from the Big Crunch (assuming it's true), another Big Bang will occur, but I still find the Big Crunch unlikely.


I see. I don't think it would retract unless there was something with a godly amount of gravitational pull or something.
#20
Quote by InvaderTSN
I see. I don't think it would retract unless there was something with a godly amount of gravitational pull or something.
I agree, and judging by what we know, I would bet money that the huge amount of gravitational force doesn't exist.
#21
I've looked into M theory and string theory a bit, with the wiki page but it's extremely confusing. Can someone elaborate on that?

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#22
Quote by ldl67
With pictures like this:
http://apod.nasa.gov/apod/image/0602/eagle_kp09_big.jpg
I've heard that they're coloured and they don't actually look like that.

Is this true?

EDIT: Sorry, I didn't realize the pic was that big.


Actually.. Their not "coloured", they just show all the different spectrums of light. So that picture DOES exist, however, invisible to the human eye.
#24
Opinions on quasars (traces of light/energy on the "edge" of the universe)

Stephen Hawking believes they could be light/energy from parallel universes.

If that's true, it makes me giddy.

Also, what of time being a 4th dimension in motion?
#25
I watched a series about quantum physics type stuff, and apparently gravity is the weakest of the natural forces.

The electro magnetic force and nuclear forces are many times stronger than gravity.

Edit: Here's the program. It was very interesting.
http://www.pbs.org/wgbh/nova/elegant/program.html
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#26
Quote by slidething31
I watched a series about quantum physics type stuff, and apparently gravity is the weakest of the natural forces.

The electro magnetic force and nuclear forces are many times stronger than gravity.

Edit: Here's the program. It was very interesting.
http://www.pbs.org/wgbh/nova/elegant/program.html


Not surprising considering the amount of mass it takes to create a gravitational field.
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#27
Quote by brandon369852
I've looked into M theory and string theory a bit, with the wiki page but it's extremely confusing. Can someone elaborate on that?



Sorry about the double post.. but heres the rundown on M=Theory (string theory) Corrections are always welcome.

First off, let me explain to you what Quantum Mechanics involves. It is the study of elementary particles and how they interect with each other, to create the phenomena we observe in everyday life. (Matter, Galaxies, Life ect.) We have many theories, such as Einsteins General Relativity, and Newtons Classical Mechanics to give us a complete understanding on gravity, and how it fonctions at medium and large scales, however, we do not understand why these laws don't apply to matter below Planck size (10 ^ -31, extremely small) This is where Quantum Mechanics comes in. These two theories are very different. One of the theories (Ensteins Relativity) can explain and predict events. Quantum Mechanics can only predict events with a probability. This is why Einstein wanted to find a theory of everything )ToE) and he did not belive that "God plays dice"

String theory and M theory try to reunite all the 4 fundamental forces (Gravity, Weak and Strong nuclear, and the Elevtromagnetic force)

It works like this. At the singularity (Big Bang) 4 of the dimensions were spread out (Time, and the 3 we observe everyday) The remaining 8 were all curled up into tiny tiny balls. This is 12 dimensions. The 13th dimension is where all the universes (An infinite amount, to be exact) Are held. M-Theory, where M stands for Membrane (He did not actually give it this name, we just use it for whatever purposes) The Membrane is basicaly our universe. These universes, in the 13th dimension, all intereact with each other, like a loaf of bread, when its split up into different breads. When the two universes collide, it creates another, and so on and so fourth.

As farfetched as it sounds, the mathematics behind it are quite compelling and complicating.
#28
Quote by MetalUpUrAss
Sorry about the double post.. but heres the rundown on M=Theory (string theory) Corrections are always welcome.

First off, let me explain to you what Quantum Mechanics involves. It is the study of elementary particles and how they interect with each other, to create the phenomena we observe in everyday life. (Matter, Galaxies, Life ect.) We have many theories, such as Einsteins General Relativity, and Newtons Classical Mechanics to give us a complete understanding on gravity, and how it fonctions at medium and large scales, however, we do not understand why these laws don't apply to matter below Planck size (10 ^ -31, extremely small) This is where Quantum Mechanics comes in. These two theories are very different. One of the theories (Ensteins Relativity) can explain and predict events. Quantum Mechanics can only predict events with a probability. This is why Einstein wanted to find a theory of everything )ToE) and he did not belive that "God plays dice"

String theory and M theory try to reunite all the 4 fundamental forces (Gravity, Weak and Strong nuclear, and the Elevtromagnetic force)


It works like this. At the singularity (Big Bang) 4 of the dimensions were spread out (Time, and the 3 we observe everyday) The remaining 8 were all curled up into tiny tiny balls. This is 12 dimensions. The 13th dimension is where all the universes (An infinite amount, to be exact) Are held. M-Theory, where M stands for Membrane (He did not actually give it this name, we just use it for whatever purposes) The Membrane is basicaly our universe. These universes, in the 13th dimension, all intereact with each other, like a loaf of bread, when its split up into different breads. When the two universes collide, it creates another, and so on and so fourth.

As farfetched as it sounds, the mathematics behind it are quite compelling and complicating.


So the 13th dimension is basically all 12 dimensions? And how exactly do all these universes "interact?"
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#30
Quote by brandon369852
So the 13th dimension is basically all 12 dimensions? And how exactly do all these universes "interact?"


Haha, exactly. Thats why its just a theory. I'm sure its very complicating mathmaticaly. but the problem is, it cant be tested.

Man, I love physics when I'm high. Makes everything more interesting, hahahaha

EDIT:

And noo, we can't observe them. We'll never be able to observe them, even if they did exist. Unless, theirs a breakthrough in the field, cause its been stuck since the 70s, with no reall conclusive evidence. Just wait for the LHC to kick in, and maybe they'll get lucky.
Last edited by MetalUpUrAss at Jun 24, 2008,
#31
I aspire to be a home-trained cosmologist, in the coming 20-30 years. I'll find a GUT.
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#32
Humans only have the ability to see in three dimensions.

Some theorists believe that Einstein and Hawking can think critically in four, but that's just theory.

Which brings up the fact that "God" or a supreme being could have built the universe in as many as thousands of dimensions. The fact that we could never even realize it makes us even more oblivious to our own existence.

You can relate it to the Trafalmadorians in Slaughterhouse-Five. Kurt Vonnegut ftw.
#34
http://www.noao.edu/image_gallery/images/d4/horsehead.jpg

Breathtaking.

I will read some Vonnegut at some point too.

*bump*

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#35
Will the fate of our universe lead to the Big Crunch?

It's impossible to say at the moment. I don't think we know accurately enough the total mass of the universe and whether gravity will ultimately overcome the energy released by the big bang. I'd guess it will.

Does dark matter and dark energy exist?

Yes. Observations of distant systems have shown there is more matter out there than interacts with light.

Does God play dice (according to Einstein, he doesn't, poetically speaking)?

Taking the question to mean "are quantum events truly random" then as far as we can tell, yes. If they are controlled by something we cannot observe, then statistics have yet to show this.

Do black holes exist?

Yes - we have observed radiation emitted by the collapse of distant stars into them.

Does there need to be a singularity for the big bang to occur?

Taking the question as "did the big bang originate from a single point event" it's impossible for us to tell, since anything that happened before the universe became transparent is unobservable and we don't have the computing power to model it with certainty.
#36
Quote by CoreysMonster
wait, so all those nebulae are artificially colored? you mean the universe is really black and white?



They do have a colour. All of these features however are detected using energy from a part of the electromagnetic spectrum outside of the visible range such as infrared and ultraviolet. What we see in the images therefore is greyscale which is then assigned a colour based on its energy level. If we were to be floating right next to the nebulae it would in fact have a colour. I am not sure what those colours would be though.
#37
Anyone else been watching 'The Universe' series on the History Channel? Learnt a lot of interesting stuff on there, one of my favourites was the weather episode. Finding out there's seas of liquid methane was pretty cool.

Plus anyone getting into astronomy/cosmology I recommend you read 'A Brief History of Time' by Stephen Hawking, and 'Parallel Worlds' by Michio Kaku. Both very interesting books, with little to no knowledge of maths needed.
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