Does the age of the universe constrain its total size?

[Pjpic]

Does knowing the age of the universe (13.8 billion? ) say anything about size of the universe (besides the observable size)?

 

[phyzguy]

No. We know the size of the observable universe, but not what lies outside of our horizon. The size could be infinite.

 

[Pjpic]

No. We know the size of the observable universe, but not what lies outside of our horizon. The size could be infinite.

Is not knowing the size the reason we don't know if the expansion will ultimately end in a big crunch?

 

[Orodruin]

Is not knowing the size the reason we don't know if the expansion will ultimately end in a big crunch?

No. We now know that it will not.

 

[sunrah]

Is not knowing the size the reason we don't know if the expansion will ultimately end in a big crunch?

We are in the early stages of a dark energy dominated universe. The expansion rate will continue to get faster and faster. Whether the universe ends in a big rip, according to current models, is still an open question. It depends on the exact form of the dark energy equation of state.