How massive is the universe?
1 Answer
It's hard to say, but it's really really big.
Explanation:
If you mean the universe as in everything around us, including outside of our galaxy, then its unknown. The universe is ever-expanding and growing, so we will never have an exact measurement.
Currently our 'observable universe' is 28 billion light-years in diameter . When you calculate that to kilometers, well you get a really really big number.
One Astronomical Unit, or AU for short, is 150 million km. And in a single light year there is 63241.1 AU. And we have 28 billion light-years in diameter that we can see.
So! Here is the math!
63241.1AU x 28,000,000,000ly = 1,770,750,800,000,000AU
1,770,750,800,000,000AU x 150,000,000km = 2.6561262e+23
So our current observable universe is 2.6561262e+23km.
Here is where someone asked a similar question with the same answer!
