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Author Topic: What is meant by oscillating Universe?  (Read 3007 times)

Offline lilkim

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What is meant by oscillating Universe?
« on: 19/07/2006 20:38:53 »
or what is the "dark matter"

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another_someone

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Re: What is meant by oscillating Universe?
« Reply #1 on: 19/07/2006 23:40:30 »
The topic title is different from the opening question I shall do my best to address both.

An oscillating universe is an idea that the universe is constantly reborn, such that at the birth of the universe one has a big bang, which then expands to its maximum size, then collapses in on itself to create a big crunch (the death of the universe), and from the crunch it rebounds into another big bang and so the universe is oscillating between a crunch and a bang.  It is by no means certain that this is the way that the universe behaves, but it is one of the many hypothesise that have been put forward for how the universe may behave.

Dark matter is an example of when the physicist can't add the numbers up to get the value they want, they invent something they think is invisible but accounts for the discrepancy in their sums.  Based on the astronomers' observations of how the universe moves, the cosmologists have worked out how much mass they think the universe should contain.  Based upon all the stars that the astronomers can see in the heavens, the cosmologists have worked out how much mass the universe should contain.  The two numbers are not the same, so the cosmologists have made the assertion that there must somewhere up in the heavens be an awful lot of mass that we simply cannot see this is regarded as the dark matter (dark because we cannot see it).



George
« Last Edit: 20/07/2006 10:19:08 by another_someone »
 

Offline lilkim

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Re: What is meant by oscillating Universe?
« Reply #2 on: 20/07/2006 05:33:13 »
so basiclly it is the dark matter that they are always trying to see? or find ways to see if anything is in it?? Is that way we have all those big government satalite dishes?

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another_someone

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Re: What is meant by oscillating Universe?
« Reply #3 on: 20/07/2006 14:44:14 »
Not sure what you mean by Government satellite dishes.  There are many radio dishes that can serve many purposes, from military to communication to astronomy.

At present, no-body that I am aware of is specifically looking for dark matter, because they really don't know what they are looking for in that respect.  They are generally looking at the movement and information about what is happening up in the heavens, in the hope that they may discover something they did not know, but without knowing if it will be related to the dark matter question or with regard to any of the many other questions they have about the heavens, or even maybe discover something the contradicts something they believed they firmly knew.  The search they are undertaking across the full range of electromagnetic spectrums, from radio waves (which is mostly what you will see with regard to the dishes), to optical telescopes, to X-ray and gamma ray telescopes (the last really can only be observed by satellite already in space, since gamma rays are effectively blocked by the Earth's atmosphere).  Any one of these may suddenly give us a breakthrough about what the nature of dark matter is, of maybe even prove that there is no dark matter at all.



George
 

Offline lilkim

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Re: What is meant by oscillating Universe?
« Reply #4 on: 20/07/2006 18:25:48 »
oh ok...so it is like a catch all....those dishes i mean...they are just hopeing for something to get picked up by them that was not caused by us...

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another_someone

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Re: What is meant by oscillating Universe?
« Reply #5 on: 20/07/2006 19:43:45 »
In a sense, that is what all science experimentation is about.  There is a notion amongst scientists that an experiment that works is less valuable than one that fails, because an experiment that works has not told you anything you did not already know, whereas an experiment that fails (assuming the experiment was carried out with adequate rigour) gives you an opportunity to learn something new about the universe that you did not predict was there.



George
« Last Edit: 20/07/2006 19:44:22 by another_someone »
 

Offline 4getmenot

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Re: What is meant by oscillating Universe?
« Reply #6 on: 24/07/2006 20:40:27 »
understood.....but that means that they have a notion that something could be out there for some reason, so it would be safe to say that our government believes in life on other planets and aliens?? and that we are okay to think the same thing right?

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another_someone

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Re: What is meant by oscillating Universe?
« Reply #7 on: 24/07/2006 21:16:34 »
quote:
Originally posted by 4getmenot
that means that they have a notion that something could be out there for some reason, so it would be safe to say that our government believes in life on other planets and aliens?? and that we are okay to think the same thing right?



There are two separate issues.

Firstly, what do you mean by 'our government believes in life on other planets and aliens'?  Do you mean that George W. Bush personally believes in aliens?  If he does, is that reason that we should also believe in aliens? (bear in mind that George W. Bush and Tony Blair also told us there were WMDs in Iraq.)

The reality is that government (except in a few high profile issues) is not one person, it is not any person, it is a process.  As such, can you really ask whether the 'process' believes one thing or another?

Secondly, there are many scientists (some of whom provide input into the government processes that allocate funds) that tell us their ought to be aliens out there (if not close by, then at least somewhere in the distance).  Only a fool (and there remain some of them as well) will tell you with certainty that there is alien life out there.  Ofcourse, to date, we have no more actually found alien life (excepting possibly some primitive bacteria) than we have found WMDs in Iraq the difference is that nobody is going to war over the question of alien life, we just keep on loooking.



George
 

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Re: What is meant by oscillating Universe?
« Reply #7 on: 24/07/2006 21:16:34 »

 

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