How long has it been known the universe is more than 100 billion light years across?

Answer 1

It hasn`t been known at all until you mentioned it . Where did you get that info ? The back of a bubble gum wrapper ?

No one knows how large the universe is ....... no one ! Well , except maybe Miss Cleo . Why not get the exact size from her and get back to us ?

Answer 2

Actually no one really knows and besides the premise behind this question is wrong. Even if the universe is closed, ie finite, it has no boundries as we understand them. The universe is not measurable in that "across" sense. Current astronomy tells us that we cannot see beyond 15 billion light years because supposedly at this time the universe at this time was opaque as atoms were too close together to let light travel in a straight line. The universe is still expanding since then so the true size and age of the universe is still a matter of intense debate. We can never be certain and can only make educated theories/guesses.

Answer 3

I did a big presentation on the universe, so I had been collecting all the information that I thought was relevant... the size of the universe, I felt was very relavent. The Universe is estimated to be at least 78 billion light years across, this was proposed in a paper in '03 (or '04... I'm not sure). But there is no reason why the universe is not infinitely big.

Answer 4

The universe is way more than 100 billion light years across.
There are many more galaxies than our Milky Way, and they're arranged in galactic clusters. These are billions of quadrillions of miles across.

Answer 5

We do not know that even now. It is all speculation. Nobody has any proof of how large the universe actually is. It is all theory and speculation. Anyone who says the KNOW it is that big is wrong.

Answer 6

The wiki gives a good account.