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Old May 28th, 2005, 01:33 PM   #1 (permalink)
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Dhill's Universe FAQ

Ok so i saw LOADS of bs and crap in the other thread, and, having taken astronomy this past semester from one of the worlds renowned astrophysics phd and astronomer, i am up to date on the most current theories regarding the universe.

Ask anything relating to space, etcetera, because i did well in the class and will be happy to answer all questions.

Im doing this cuz the other thread was full of crap and bs that nobody knows what they are talking about.
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Old May 28th, 2005, 01:36 PM   #2 (permalink)
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and it started to become a flame war

what were some of the threories your teacher had? like if the universe is round or what other shape...stuff like that.
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Old May 28th, 2005, 01:41 PM   #3 (permalink)
 
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How does one "travel" through the fourth dimension? As in, how we percieve time progressing. Is it like a steady fall, or is a forcible thing? Is it angled? Can the rate and direction be changed?
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Old May 28th, 2005, 02:09 PM   #4 (permalink)
 
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how does science know these things about space if they have only been there a few times and it is just empty space?
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Old May 28th, 2005, 02:10 PM   #5 (permalink)
 
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How was all matter compressed into something smaller than a proton? Is there a limit to how much matter can be compressed?
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Old May 28th, 2005, 02:20 PM   #6 (permalink)
 
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arent solids incompressible........why did the ball of matter explode? can i have a dollar
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Old May 28th, 2005, 02:20 PM   #7 (permalink)
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Quote:
Originally Posted by EnergizerBunny
how does science know these things about space if they have only been there a few times and it is just empty space?
they have created mathematical equations that represent their theories and they have been tested w/ curret knowledge and proven to work.
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Old May 28th, 2005, 02:24 PM   #8 (permalink)
 
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so stuff comes from nothing. Where did space come from, why is it black and not white, why is their space, what is outside of space, why did darwin convert to christianity?
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Old May 28th, 2005, 02:26 PM   #9 (permalink)
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why do u keep bringing religion up?

space didn't come from...it's always been. It's black b/c there is nothing for us to see in our light spectrum. Outside of space is nothing, or possibly other demensions or universes.
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Old May 28th, 2005, 02:28 PM   #10 (permalink)
 
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space is nothing, why is their nothing outside of nothing.
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Old May 28th, 2005, 02:29 PM   #11 (permalink)
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Quote:
Originally Posted by EnergizerBunny
why did darwin convert to christianity?

He didn't. Thats a lie propagated by the church.

Also, completely irrelevant.
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Old May 28th, 2005, 02:32 PM   #12 (permalink)
 
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proove it
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Old May 28th, 2005, 02:57 PM   #13 (permalink)
 
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<Clamps hands to ears> AAAAAAAAAAAAHHHHHHHHHHHH!!!!!!!!!!!! <Runs away from room in horror>

You people can't have any discussion without degenerating into a flamepit.
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Old May 28th, 2005, 03:22 PM   #14 (permalink)
 
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Quote:
Originally Posted by EnergizerBunny
proove it
I thought that too, but a 30 second google search corrected that.

Mac: It's more of a rumor and there is no proof that the church started it.
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Old May 28th, 2005, 03:38 PM   #15 (permalink)
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Quote:
Originally Posted by themailleman
Mac: It's more of a rumor and there is no proof that the church started it.

True, I mispoke.
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Old May 28th, 2005, 03:38 PM   #16 (permalink)
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if you were to travel at the speed of light to another galaxy, would you age when you return to earth?
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Old May 28th, 2005, 03:42 PM   #17 (permalink)
 
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Wouldn't the accelerating or decelerating from the speed of light kill you unless you took a loooong time to do it?
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Old May 28th, 2005, 03:48 PM   #18 (permalink)
 
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its so stupid how people think that time can be manipulated(sp?).like if ya go fast it slows down or sumtin stupid like that.or time travel is possible because time is a giant blanket and if we fold it over we can go to a different time period.all ghey farkin theories.

Time is just sumthing we use to measure how long sumthing takes.....it isnt a dimension.

AND IF TIME TRAVEL WAS POSSIBLE PEOPLE WOULD BE SHOWING UP NOW FROM THE FUTURE!!!!!!GOD!!!!!

the last statement proves that all time travel theoires are wrong.
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Old May 28th, 2005, 04:01 PM   #19 (permalink)
 
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how are we supposed to know that your not a human sent from the year 78923 to make that statement in order to try to crush our hopes on time travel so your family wont be murdered by an evil russian.
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Old May 28th, 2005, 04:42 PM   #20 (permalink)
 
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I thought dhill was answering these questions? I smell another flame war
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Old May 28th, 2005, 04:59 PM   #21 (permalink)
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Energizer, you need to cool it.
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Old May 28th, 2005, 05:03 PM   #22 (permalink)
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do black holes move?
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Old May 28th, 2005, 05:06 PM   #23 (permalink)
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fenix
what were some of the threories your teacher had? like if the universe is round or what other shape...stuff like that.
---The universe is thought to be somewhat globular, and is ever expanding at near-light speed. So in fact more space is being created as we speak(latest theory). We know this because of a very low frequency cosmic background radiation(CBR) from the Big Bang. After its discovery COBE(cosmic background explorer) was sent into space to see whether the radiation was really uniform. COBE discovered that there are slight variations in temperature all over the universe, which tells us that the Big Bang was not uniform, and thats why galaxies are spread irregularly throughout the universe.

Hippomaster
How does one "travel" through the fourth dimension? As in, how we percieve time progressing. Is it like a steady fall, or is a forcible thing? Is it angled? Can the rate and direction be changed?
---Maybe you could reword your question. I'll answer it best i can though. We travel through time just as we travel through space. Einstein's relativity theory states that the universe is made up of the fabric of spacetime. Gravity warps spacetime, and that is how light is bent, things orbit, and how everything essentially 'works' in the universe.

Yes, time can be warped, just like space can(density, etc). Lets say for example you are crossing the event horizon of a black hole. The event horizon is the "point of no return" where nothing, not even light, can escape from the force of a black hole. To someone far away it would appear as if you were being stretched and pulled into the black hole BUT to their eyesight they would see you eternally hovering over the event horizon, never to fall in. To you falling in, it would be less than an instant and you would be sucked in and crunched into black hole matter.

Another way time can be warped....if someone was to get into a spaceship and travel near light speed for 15 years, turn around, and come back to earth, it would feel like 30 years to that person. But he would see the earth aged over 200 years and would know noone on eath. It is because earth is somewhat fixed, while the traveller's time is dilated at that high speed. So yes, time can be warped, and rate can be changed as well


EnergizerBunny
how does science know these things about space if they have only been there a few times and it is just empty space?
---please be more specific. An example though: we know masses of certain stars because of how they orbit around other stars. We do not know masses of solitary stars, but 2/3 of all known stars are involved in a binary system, so we know all those masses b/c of the effect they have on things around them.


TippmannA-5
How was all matter compressed into something smaller than a proton? Is there a limit to how much matter can be compressed?
---This is the part of the class that i was skeptical on, but found it more believable the more i learned about it. Before Planck Time, which is 10-43seconds after the Big Bang, we do not know what the universe was like. Before this time all our current laws of physics fail to explain anything, because forces of gravity, weak and strong nuclear, were not stabilized and so we know very little about before Planck Time. Anyways, before the Big Bang, there was no matter. All there was was energy, and the Big Bang spewed out this energy everywhere in the form of matter, and in the time to come all the 'ingredients' for atoms and such were formed. If you are skeptical, Einstein supports this theory by way of his E=mc2. Energy=mass x speed of light squared. That is a huge energy for what mass/matter is. Ask more if it doesnt make sense.


EnergizerBunny
arent solids incompressible........why did the ball of matter explode? can i have a dollar
---solids are not incompressible, humans simply do not have the technology or strength in any form to compress things the way gravity can. And no.

"Stuff" came from energy, and look at the answer i gave to Tippmann, and you can see how energy became matter. It is black because a lot of it isn't emitting light. Something must be energetic to be emitting light, and most of space is cold and where dark matter is(the majority of mass in the universe) there will not be light emitted.

Christianity has nothing to do with this discussion, please do not bring it up.


bobide
space didn't come from...it's always been. It's black b/c there is nothing for us to see in our light spectrum. Outside of space is nothing, or possibly other demensions or universes.
---space has not "always been". Unfortunately we dont know what happened before Planck Time, so we cannot ever know what happened before that time. There is no 'outside of space'. Spacetime is what is, besides that, there is nothing(physical).

ja289
if you were to travel at the speed of light to another galaxy, would you age when you return to earth?
---travelling at light speed to another galaxy would be impossible, because the closest one(Andromeda) is 2 million light years away. Anyways, travelling anywhere near the speed of light will cause people looking at you from a fixed position to age much faster than you.


themailleman
---there is no possibly way for us to ever travel at the speed of light


JonesBaller
---time is a dimension, study up.


Energizerbunny
----please dont clutter the thread.
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Old May 28th, 2005, 05:08 PM   #24 (permalink)
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do black holes move?
Yes, just like any other object in the universe it is orbited by objects and orbiting other objects. Everything in the universe is in motion.
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Old May 28th, 2005, 05:11 PM   #25 (permalink)
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Is it possible that Entering through a black hole would spit you out on the other side of the universe? Wha'ts the deal with that theory?

What about wormholes? Have there ever been any observations of these, or are they just theories?
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