I still haven't been there this summer, it's a 3 minute drive and I still need to visit.

jeepers i thought the bigger the planet the stronger the gravitational pull< ( if i use the right word)

gravity is based on mass, not volume.

Density my good man, changes everything.

time is space moving in a direction that we can't understand, according to string theory.
i don't believe that anything that you can't answer is possible, unless you can otherwise demonstrate it.
in this case of theorhetical mathematics, there is a simple solution. The numbers quite obviously point out that it's impossible. Not theory, fact.

I thought they measured the explansion of the universe based upon the redshift of observable light, too.

It's definitely bigger than 15 billion lightyears, as space itself is expanding (and accelerating, too) faster than the speed of light.