What is the size of the universe in kilometers?

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Answer 1 · 2016-05-30T02:05:32

#2.6 X 10^26 km=0.26# billion billion billion km or more

Universe is infinite-directional. Assuming that the center of our

universe is at 13.8 billion light years (ly) from us, the size is nearly double this.

In km, this is #27.6 X 10^9 ly#

#= (27.6 X 10^6)(365.26 X 24 X 60 X 60)# light seconds (ls)

#= 8.7 X 10^17 ls = (8.7 X 10^17)(299792456)# km

#= 2.6 X 10^26# km.

If there are more galaxies beyond Milky May, the size might be larger.