# Theoretically how wide is the universe?

Couldnt you take the how old the universe is times the amount light travels in one year. That would get you the radius thought but then you times that by 2. Since assuming the universe expands at a constant rate at the speed of light. Then that should get the diameter of the universe, the universe is probably like a giant ball since it would travel outwards from the big bang.

Heres what I got on the diameter of the universe in AU. 8.86208855x 10 to the 14th

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• scowie
Lv 6
8 years ago
Favorite Answer

That's only the observable universe you are trying to calculate there. The universe is likely to be a hell of a lot bigger than that. It may well be infinite. As for the universe expanding, this documentary may enlighten you...

http://www.youtube.com/watch?v=1yTfRy0LTD0

&playnext=1&list=PL35A32C6E877FEAC3

• John W
Lv 7
8 years ago

Except that with the big bang theory, there is a period of inflation where space expanded faster than the speed of light.

There are efforts to try and measure the size of the universe by studying the harmonics in the CMBR. Much as a string's lowest frequency is determined by the size of the string so are the lowest fundamental frequencies in the CMBR. Also the harmonics should indicate the shape of the universe.

• 8 years ago

We can see 13 billion light years, but the universe is 93 billion light years across in theory, so much of it is not visible. If out Milky Way Galaxy were the size of a BB, Andromeda would be 2 inches away and the total universe would be a 1 mile diameter ball.

• 8 years ago

There is not an answer to that. First off IF there was a "big bang" then it was an explosion. If you watch an actual explosion take place in slow motion all the material does not expand out at the same rate in a even fashion. Some of the material stays in the general area of the initial event. The shape is not going to be a balloon, ball or uniform in any way.

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• 8 years ago

At present we can only guess as a few billion light years. By the time you read this , it could have expanded further ! Let us see an often quoted story :

Emperor Akbar asked his court jester Bir bal, "How many crows are there in Agra" Bir told a wild no that came to his tounge" acrbtnu.." nos . Akbar : " are you so precise ? Suppose it is more or less by a few dozen ?" Bir: " If less it is due to their flying away, if more, due to more intruding into Agra from nearby areas !" . Akbar was convinced, & happy .

• Anonymous
8 years ago

The universe, what we know if it is 90 billion light years wide.

The part of the universe that we cant see is absolutley massive. it is estimated that those 90 billion light years is compared to the actual size of the universe is comparable to the size of a quarter compared to earth.

The universe is mind-blowingly huge

• Anonymous
8 years ago

A better question may be, what was the area before the universe. Discover that and you'll be a nobel prize winner. And no it's not dark matter.

• Anonymous
8 years ago

Radius: 10^26 m.

Mass: 10^54 kg.

• Steven
Lv 4
8 years ago

Wow, I really don't know how big the universe is. It could be too big to calculate, no?

• 8 years ago

Well, its at least 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 miles wide.

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