Question

How big is the universe in kilometers?

Answer 1

Size of our universe is greater than `1.3055 X 10^23 km =130.55`

trillion billion km.

Explanation:

Units used;

1 billion = 1000000000

1 trillion = 1000000000000

1 year = 365.256363 X 24 X 60 X 60 s = 31558150 s

1 light second =299792.258 km

1 AU = a for the elliptic orbit = 149597671 km

1 light year = 65242 AU

The 5-sd approximation to a minimum, for the size ( diameter ) of

our universe.is

2 X 13.799 billion light years (bly).

This being a 5-sd approximation, the number of sd in the answer

is restricted to 5-sd, for reliability.

In AU, this is #13.799 X 6.3242= 872.676 billion AU

In km uni, this is `1.3055 X 10^14` billion km

=130.55 trillion billion km.

Important note: This is all about universe and not the holistic

whole, `the` universe. Size 2 X 13.799 bly is the ( 2015 ) scientific

surmise, for our universe, based on our Big Bang theory and

measurements,