Anonymous asked in Science & MathematicsAstronomy & Space · 1 month ago

Is it possible that our universe could be 10^10 millions of times over light years in diameter and circumference ?

8 Answers

  • 1 month ago

    We have no idea how big our universe is. It could be any size or even infinite. 

  • 1 month ago


    Our universe is about 94 billion light years across. Anything beyond that is permanently outside of any possibility of detection or observation.

    But if you want to fantasize about stuff that can't ever be detected, then go ahead. Join the hordes who like to do just that, safe in the knowledge they can never be proven wrong.

  • Anonymous
    1 month ago

    Universe is flat, just like the Milky Way and The Earth.

    Learn The Facts!

  • Anonymous
    1 month ago

    The Big Bang is likely around 10^21 lightyears in diameter, based on best guesses of the properties of Early Inflation.  That's about a million times bigger in diameter than 10^10 million.

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  • 1 month ago

    Imagine yourself on a ship in the middle of an ocean. You (and other scientists) have established a link between the speed of the wind (past and present), the surface tension of the water, and the size and frequency of the ocean's waves (seas and swells).

    From your ship, you cannot see beyond the horizon. No matter how strong the binoculars, that horizon remains at the same distance (a few dozen nautical miles, at most - which is nothing if you are in the middle of the Pacific).

    However, you do notice that the waves come from beyond the horizon. Near the horizon (once you correct for foreshortening effects) the waves seem to behave in the same way as they do near the ship.

    Your conclusion: the ocean continues beyond your horizon, and seems to have the same properties "over there" as it does near the ship.

    Data collected by the probe WMAP back in the late 1990s, gives us the same kind of information about our universe, and its apparent horizon located some 13,800 million light-years from us (let's call it 1.4*10^10).  Based on analysis of the data, it would appear that our universe extends at least three times the distance to our apparent horizon.  At least.  Could be more. But it is unlikely to be less.

    So we are now up to a radius of (let's say) 4*10^10 light years.

    Of course, when we "look" that far back, we are looking into the past. Space has been expanding throughout the time it took photons to reach us from the horizon, so that the source of these photons, if it still exists, is now much further away. If we factor this expansion, the radius of our universe is AT LEAST 1*10^11 light years in co-moving distance (the distance we would observe IF we could see things are they are now).

    Every time we have tried to prove that the universe is not infinite in size... we have failed. This is not proof that the universe is infinite. It is only a hint that it is too early to exclude the possibility that our universe may be infinite.

    There are various ideas, in science, as to how the whole universe could look like (mathematically). Some of these require the use of hidden dimensions. Some of these require that the universe be finite (not infinite). However, none of these conditions can be tested (yet).

    Since your proposal lies between the minimum (10^11 l-y) and the maximum (infinite), then it is "possible".

    Not very likely... but possible.

  • Dixon
    Lv 7
    1 month ago

    Very unlikely to be any specific size that you guess. Chances are it is either some specific size you will never guess or actually infinite.

  • 1 month ago

    Yes it is possible, but how would we ever know? There is not the slightest chance of ever seeing or getting any other signal or indication of anything that is further away than 46.5 billion light years.

    We do know this: light that has been traveling for 13.8 billion years shows a universe that looks pretty much like our own local space looked 13.8 billion years ago. That's consistent with the idea that the whole universe is at least 250 times larger than the observable universe. It's also consistent with the idea that the whole universe is infinite in size.

  • User
    Lv 7
    1 month ago


    In fact

    the possibility exists that the Universe is literally infinite in expanse (and, therefore, shapeless)

    or alternately

    as you suggest

    that it is not, that it has a limited size and shape.

    Surprisingly, even here the possibilities are several and quite technical, quite difficult to "wrap your head around"

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