Why does the Universe need to expand? isnt big enough as it is?What if it didnt expand?

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  • 1 decade ago
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    some people say, the universe is decreasing the speed that it's expanding... then ever sooooo slowly, it'd start shrinking.... til it's the size of a marble, than the big bang would happen all over again. but im thinking the universe is expanding because of inertia?

  • 1 decade ago

    Not that it needs to expand but it is all physics. Ever watch a fire work? It explodes and the teeters out. Well the theory of the big bang is that the explosion was so powerful that it just will keep expanding forever till it either teeters out like a fire-work or if there is a big crunch, all the matter coming back together now a big crunch can only happen if there is enough matter in the universe. Matter=gravity...And if there is not enough it will be a really lonley night sky in about 10 billion years.

  • Anonymous
    1 decade ago

    It doesn't "need" to it just does. There is no "enough" about it, It's not like the universe is thinking about something. It expands from natural laws of physics.

  • 1 decade ago

    the universe needed to expand at first.

    It is a finite entity so it will come to an end.

    If it continued to expand it could not come to an end.

    At this time the fabric of space is shrinking,it's density is becoming less and it will eventually go out of existence.

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  • 1 decade ago

    I dunno Bao, I've heard that the expansion rate of the Universe is accelerating. Which is a mystery of course because you need some kind of force applied to be able to accelerate. Most astronomers believe it's due to Dark Energy. There is of course no conclusive evidence that Dark Energy exists. Why we started expanding in the first place is of course attributed to the Big Bang. If we will ever stop or if it will ever reverse is the topic of much speculation.

  • 1 decade ago

    First fallacy... the Universe doesn't "Need". It merely does. And it IS expanding. The rest of the question is irrelevant.

  • Anonymous
    1 decade ago

    It doesn't need to do anything, it IS expanding. We don't exactly know why. Everything is just redshifted (moving away from us) I don't think that anything would happen if it didn't expand, it just does.

  • Gene
    Lv 7
    1 decade ago

    It is simply expanding and its speed of expansion is increasing.

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