^^^^^
Has no clue about what General Relativity says about the nature of the universe.
*****CHUCKLE*****
The you'll be able to quote a real scientist (and a link) who explains why the universe has a boundary. It's ok, I'll wait.
Hahahaha. It doesn't matter since you won't get it anyway. Can you explain why evo thinkers do not think there is a boundary? No.
Thus, you won't be able to understand something that is equally complex.
One evidence of a bounded universe is excess redshift in quasars (farthest away from earth). One example is Galaxy NGC 4319 and the nearby quasar Markarian 205 which have very different redshifts (cz = 1,700 km/s and 21,000 km/s respectively). However, looking at photos from Hubble, we can see that they are connected. If the universe was expanding infinitely as evos hypothesize, then their redshifts would be the same. Creation scientists think that it has to do with curved spacetime since this is observational science. You can read "Seeing Red: Redshifts, Cosmology and Academic Science" by Halton Arp (Not a creationist afaik, but a scientist who uses observational science and uses what he observes to formulate a hypothesis. He doesn't find existence of dark matter and doesn't believe the universe is expanding.).