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Bizzarro Universe! It all makes sense now! ROTFLMAO.
Sorry. I just couldn't hold myself.
Sorry. I just couldn't hold myself.
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Yes, I mean that the change is only noticeable on really large scales. In fact, even our galaxy isn't expanding with space-time. It is larger scale than that. It is due to what is the dominant force for the object.Originally posted by Azazel
So let me get this straight, while, say a human being grows say, 2% in length, a planet grows 10%? No, this can't be right. you probably mean that the change is only noticeable on extremely large scales. Also, as I understand OBJECTS don't grow, it's the space that does?
Let me give another analogy. When you get into a roller coster, different parts of your body are accelarated at different rate, but your body doesn't fly apart because the molecular bond holding you together are stronger than the forces that the roller coster exerts.
Similarly, the bonds in your body are far stronger than the expansion of the universe, so you stay the same size. Even gravity is stronger, so the moon-Earth distance isn't increasing. Even distances within out our galaxy aren't increasing because gravity holds it together. It is only really far distances, where gravity is extremely weak (remember it goes down like 1/distance^2) that the expansion of the universe is dominant.Comment
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Or if it isn't spherical, you will keep going forever....Originally posted by Azazel
The universe doesn't have an edge, as apparently (
), if you go one way real far, you'll come out of the other end.
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I don't think that "Spherical" is the best way to describe it. Unless it's a 5 (?)- Dimentional sphere.
(My poor brain. Just had a Diff. Eq. test, and now this?
)
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Everything you 'see' (ie. with your eyes) is emitting light. Light hits it, is absorbed, and remitted. You can build up a picture of what is there because it is interacting with light.Originally posted by Japher
I don't get this. Not everything that can be seen emits light, a lot/most of it reflects light, right? What the heck are they saying dark matter is? Mini Black holes?
Things which to not interact with light, you will not see. A gas, for example lets (most of) the light pass straight through, so you don't see it.
Similarly, the particles they are looking for do not interact with light. Actually, anything which doesn't have an electric charge will not interact with light. They are being a little simplistic in the article - the point about WIMPS is they almost don't interact with anything at all!Comment
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Why not?
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Or Donut shaped.Originally posted by Rogan Josh
(This is all supposition of course - the universe could be spherical (and therefore not infinite) for all we know.: travel in one direction long enough and come back to where you started.)
Mmmm... Donuts..."I read a book twice as fast as anybody else. First, I read the beginning, and then I read the ending, and then I start in the middle and read toward whatever end I like best." - Gracie AllenComment
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Think about a balloon as it expands...Originally posted by Azazel
well, if Space/time itself expands, what does it expand over?
Now, imagine that that balloon represents a 2-D universe to the inhabittants in the rubber of that balloon as the balloon expands in a third direction.
Now add a dimension to take the analogy to our universe.. Poof, viola.
(Of course, IIRC, there's something like at least 7+ dimensions in our universe...
)
"I read a book twice as fast as anybody else. First, I read the beginning, and then I read the ending, and then I start in the middle and read toward whatever end I like best." - Gracie AllenComment
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Why not?
I'm a MACHO man. Yes, I know there are not nearly enough of them, until I'll see solid proof of those particles, I'll stick with the familiar. I don't know why, really.
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Rogan: thanks for the tutorial.
I never thought of the light being remitted more so reflected. After some quick research I found that I was both right and wrong.
good lesson
Sad, isn't it, that I have a degree in chemical engineering and my physics is so bad. It has been some time since I have had to do anything with optics.
I still don't get thier theory on this Dark Matter. If it doesn't interact with anything at all, then how can it exist? Is this some sort of neutron? A mass without a charge? Odd, sounds to be stupid theory to me, but hey.Comment
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Edan: why do you say there are 7+ dimensions? Last time I looked, there were 4.Comment
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Are you considering time as one of those dimensions?Originally posted by Rogan Josh
Edan: why do you say there are 7+ dimensions? Last time I looked, there were 4.
Simply because you can't see a dimension, doesn't mean it isnt there.
String Theory requires something like 7 or 11 dimensions, etc And then theres all that other fun higher order physics stuff...
However, even ignoring time, there would have to be four extra dimensions. Consider the balloon example. That has 3 dimensions for a 2D balloon person, without time being added in - and yet those 2D balloon people can't see the third dimension. To them. the world only goes in two directions, in the balloon..."I read a book twice as fast as anybody else. First, I read the beginning, and then I read the ending, and then I start in the middle and read toward whatever end I like best." - Gracie AllenComment
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It does interact. It just interacts really really weakly. If it didn't interact at all the experiment in the Boulby mine would be pretty pointless, because they obviously wouldn't detect anything!Originally posted by Japher
I still don't get thier theory on this Dark Matter. If it doesn't interact with anything at all, then how can it exist? Is this some sort of neutron? A mass without a charge? Odd, sounds to be stupid theory to me, but hey.
Yes, they have no charge, like a neutron. Why do you think this sound stupid?Comment
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