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MatthewMk2

How Big is Our Observable Universe?

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46 billion light years (that we can see) 93 billion light years total (or so they think).

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Very big

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Every second, every moment, every year the universe expands

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The galaxies are drifting apart slowly, So it's expanding. Pretty soon we won't even see them

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28 billion light years in diameter.

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wickedpissah

Go to youtube and type in "Monty Python Galaxy Song."
That'll explain it all.

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By 1784 science recognized the universe as being the Milky Way of 8,000 x 1,500 Light Years (LY)
By 1906 they decided that it was actually 23,000 x 6,000 LY
1912 the universe size was expanded by scientists to 170,000 LY.
By 1920 the dimensions of the galaxy were revised to 55,000 x 11,000 LY. (Now it is assumed to be about 100,000 x 20,000)
( Have you heard of the Andromeda Galaxy? Well, less than a 100 years ago scientists called it the Andromeda Nebula because the "fact" was that it was a gaseous nebula 19 light years from earth. In 1924 it was discovered that the Andromeda Nebula was actually NOT a nebula but another whole galaxy and was at a distance of 750,000 LY. In 1952 the distance was changed again to 2,300,000 LY. Now Google shows it at 2,540,000 LY. )
In the 1950s the furthest galaxies said to be about 1 - 2 billion LY away.
Within the next few years ( by mid 1960s) they were said to be 9 billion LY
The universe is now thought to be 156 Billion LY Wide!

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Unlimited

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Endless ....

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