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How is it that the universe can be 13.7 billion years old, but somehow 93 billion light-years wide?

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  • Tom S
    Lv 7
    2 months ago

    Because space is expanding.

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  • 2 months ago

    CAN  possibly  might be, the oldest and farthest light we can observe,started out 13.something billion yea could be,rs ago,,beyond which we can only speculate,,wonder what is beyond that boundary

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  • 2 months ago

    Because of its Volume

    13.7 Billion Light Years Cubed

    ^3

    Anybody want to buy a Calculator ?

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  • Zheia
    Lv 6
    2 months ago

    The light from when an object was 13.7 billion light years away will have reached us, and we would be seeing the object as it was 13.7 billion years ago. But in the meantime, over those 13.7 billion years, the object would have moved further through space. If we were able to see the object as it was now, at this moment, it would be 46.5 billion light years away.

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  • MARK
    Lv 7
    2 months ago

    I do not understand why think the size of the universe in light years should be the same as its age in light years. That would assume one of two things. First, the universe suddenly appeared 13.7 billion years ago and was instantly 13.7 billion years in diameter. The second, is that the universe has steadily increased in size by 1 light year per light year in time.

    The size of the universe is the result of its expansion from the singularity. It did not do this at a constant velocity by it accelerated. There is no reason at all why the universe should by 13.7 light years wide.

    I am not an astronomer but the answer only requires a little thought. A little thought would have rendered this question unnecessary

    • Spaceman
      Lv 7
      2 months agoReport

      A light year is the DISTANCE that a photon travels in one year, about 10 trillion kilometers or 6 trillion miles. A year is the TIME required for Earth to travel in its orbit around the sun one time, about 31.5 million seconds. They are NOT the same thing.

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  • 2 months ago

    Because the expansion accelerates, and since space itself is expanding rather than masses that doesn't violate special relativity.

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  • 2 months ago

    In the 13 billion years that some light has been traveling to us, the universe has been expanding. The stars that emitted that light are now 46 billion light years away from us. That makes a diameter of the visible part of the universe about 92 billion light years. 

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  • Bill
    Lv 6
    2 months ago

    don't understand distance and speed do you

    13.7 billions is years of age

    93 billion light years is the distance traveled at the speed of light.

    to put it in terms that you can understand -- you are 10 years old and the distance from you to the other side of the world is 36,000 miles

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    • KennyB
      Lv 7
      2 months agoReport

      During expansion, the universe expanded FASTER than the speed of light.  It was not inhibited by the so-called "cosmic speed limit".  Consequently, the farthest light we can see is no more that 13.7 light years away but the 'width' of the universe is significantly greater than that.

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  • 2 months ago

    Because the rate of expansion is greater than the speed of light. We view objects such as galaxies moving away rather quickly, which seems to be the universe stretching and expanding. 

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  • 2 months ago

    So you assume that the galaxies are moving apart at the speed of light?  Why would you assume that they can move that fast?  Also, they are fighting gravity at the same time.  That is assuming that they started expanding from the same point in the universe.

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