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    Default What is the universe?



    Sorry guys. Another noob question. Is the universe "space" or is it every known object in space?

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    Default Re: What is the universe?

    Quote Originally Posted by chef alan View Post
    Sorry guys. Another noob question. Is the universe "space" or is it every known object in space?
    All of the above.

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    Default Re: What is the universe?

    Wouldn't that mean that the theory that the universe is expanding is wrong? If we can't measure the universe then we have no reason to think its expanding right?

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    Default Re: What is the universe?

    We can measure the observable universe and we do observe the space between galaxies expanding and accelerating.

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    Default Re: What is the universe?

    So it's impossible for it to be the result of gravitational pull from massive unseen objects? Maybe gravity gets weaker from distance but does not completely disappear. So the pull happens over time. For example, maybe earth will be closer to the sun in years to come. Or maybe we will get closer to andromeder in time.

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    Default Re: What is the universe?

    Quote Originally Posted by chef alan View Post
    So it's impossible for it to be the result of gravitational pull from massive unseen objects?
    Not really sure what the "it" is you're talking about.

    There are any number of things that COULD affect the orbit of the earth around the sun, so we could get closer to it (including thrown into it) or farther away from it (including thrown out of the solar system), but we will definitely (if we stay in the same orbit which is likely) get closer to the surface of the sun as it inevitably expands.

    The Milky Way IS getting closer to Andromeda and we will eventually collide (Integrate) into a new and larger galaxy. Some galaxies gravitationally bound to each other are getting closer, but galactic groups are all moving away from each other.
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    Default Re: What is the universe?

    I don't think cosmology really lends itself to "layman's" explanations or analogies or simplistic models.To understand it at all, you need to study it seriously and dig deep. You can't really get it on a casual or superficial level, and it takes a lot of math to have a deep understanding. I don't have it. But if I am wrong and there is a "Cosmos for Dummies" available, let me know.

    You have to start somewhere, and genuine curiosity is a good place to start.
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    Default Re: What is the universe?

    I just don't think that something that is endless can expand.

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    Default Re: What is the universe?

    Is the universe "endless"?

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    Default Re: What is the universe?

    Quote Originally Posted by Ozman13 View Post
    Is the universe "endless"?
    Well, it's been around at least as far back as I can remember!
    Anyway, the universe actually has only two basic features: (1)space/time, and (2)matter/energy. And those features are related to each other, and interact with one another, in accordance with a set of rules we call "laws of physics." Unfortunately, we only know some of those laws. And some of the ones we do know are (at least) not quite complete. There, that's my ultra-condensed summary of the whole universe. The rest is finer details and commentary. For more, see Wikipedia.
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