How many AU is the universe across?
At least 1.74 million billion AU and utmost 5,85 million billion AU.
Using Hubble constant, the observable universe is at least 13.8 X 2 =
27.6 billion light years across, and in AU unit, this is
27.6 X 62900 billion AU = 1.74 million billion AU.
Further research reports reach an estimate 93 billion light years
and this is 93 X 62900 billion AU = 5.85 million billion AU.