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  1. #1
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    Default Is the Big Bang still banging?



    OK everyone, you are going to have to explain this in easy language for me, because I'm not so good at complicated stuff. I can understand the big bang theory if we are living in an oscillating universe. I know that theory has been proven wrong, but I can imagine it. I can also understand a big bang theory where there was a giant explosion that sent everything flying apart and that someday everything will run out of motion and die down to dark, cold rocks in space. This is the way it is often explained. I can't understand a Big Bang theory, such as has now been shown, where everything is still picking up speed and the rate of outward expansion is still climbing. All the theories I see in my mind hold onto entropy and a gradual slowing of expansion. Are we still living in an ongoing big bang? Is dark energy growing? Is energy still being created? Would expansion acceleration affect our theories of the big bang?
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  2. #2
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    Yep, too weird for me to understand too. On the other hand, if the evidence shows that that's what it's doing, we have to accept that.

    I don't think anyone really understands it. The result was unexpected, so the theoreticians are still scrambling to explain it. No one has got a good explanation yet. They are still working on it.

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  3. #3
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    Steady state theory, big bang theory was and is our best attempt at explaining our position in this Universe. Like you Rob, I like the simpler explanation to things which is not always possible. When last I looked at the theory it seems that dark matter is acting like a stream and would appear to be moving in a particular direction.
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    I read recently a mind blowing article about this, you post brought it back to me . I wish I could remember where I read this. The things that stuck in my head, there are reasons to believe the universe is far more massive than we can see. The visible universe may be to the actual universe is like a proton is to the visible universe! The other point was there may be as many big bangs as there is stars, like raindrops falling in a pond!

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    Default

    this is a very interesting subject.

    for what i've been reading around the reason why the universe is still expanding is the dark energy. the science community still don't know what this is but they know such a thing repels the cosmos objects one form the other. so all that is know is a result of observation and computer simulations.

    so its like a clash of titans: the gravity tends to bring things together but this dark energy repels them.

    but i wish someone explained me how can we be sure this repelling movement of matter in the cosmos is nothing but the effect of inertia as a result of the big bang... maybe the vector configuration in the repelling courses? anyone?

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    Quote Originally Posted by snGus View Post
    maybe the vector configuration in the repelling courses
    Say what? Best to steer clear of the techno-babble.

    Inertia would tend to keep things flying along at the same speed they always have. Gravity would tend to slow things down. But everything is speeding up. So there is something else at work.

    Dark energy is just a techno-babble word for "something else". They don't yet know what it is.

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  7. #7
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    Default

    Not only is the universe still expanding, it is accelerating. In the last couple of years, even the Big Bang Theory is being called into question in favor of the concept of new multiple universes "budding" off of existing ones or even the possibility that our universe is the result of two parallel "brane" universes bumping into each other. In any case, it's looking less and less like there was ever a beginning or and end.

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    Dark energy and dark matter are just "terms" being used for something we do not understand and cannot observe DIRECTLY.

    Hopefully experiments at the Large Hedron Collider during the next few years will shed light on these concepts.

    Right now we just do not know if

    Our math is wrong

    The General Theory needs to be altered when measuring the LARGE scale universe

    Some other unknown "particle" offsets gravity at a large scale

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    Default

    Quote Originally Posted by Joe Lalumia View Post
    Dark energy and dark matter are just "terms" being used for something we do not understand and cannot observe DIRECTLY.

    Hopefully experiments at the Large Hedron Collider during the next few years will shed light on these concepts.

    Right now we just do not know if

    Our math is wrong

    The General Theory needs to be altered when measuring the LARGE scale universe

    Some other unknown "particle" offsets gravity at a large scale

    Clear skies!
    Sorry be a stickler, but math is never wrong. Physics can be wrong, our interpretation of an equation can be wrong, but mathematics is absolute.

    Anyways, there are people who think that dark energy may not exist. There are ideas which would explain the observation that galaxies appear to be moving away from us, but that the Universe may not be expanding at all.

    Although it probably is, but one must always remain skeptical and consider other interpretations of the data. This is a big mystery in modern physics, and there are no definite answers right now. It will be the task of the next generation of physicists and cosmologists to figure this out.

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    One thing to keep in mind is that things are not flying apart per se, since the big bang was not an explosion. Rather, space started becoming bigger, and it has bnever stopped doing that. The whole universe has been expanding, possibly at different rates of expansion. There is some (disputable, in my mind) evidence, based mostly on type IA supernovae as distance measuring devices, that the universe is expanding at a faster rate now than it was in the past, in spite of gravity, which should slow it down. That implies a source of energy, yet unknown, and named dark energy. It may turn out not to exist, but many astronomers right now believe it does. Then there is dark matter: the evidence for that is much more solid; so, there is much more matter in the universe that we haven't seen yet.

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