If our universe is expanding due to 'the big bang,' what could possibly stop its expansion?

If all the other galaxies are speeding away from us in all directions, then we must be the center of the universe. Of course, we are not the center of the universe and we don’t know where that is.

When the big bang went bang, there had to be space already present for all that expansion to take place. (I’m not ready to ask that obvious question.)

Nasa, hopefully, will finally launch the James Webb Space Telescope in October. Its primary mirror is three times that of the Hubble, plus it is equipped with infrared technology. It is a staggering leap, for my primitive mind, from a 7 ft. to a 21 ft. primary mirror.

So. Are we going to see proof for all the current theory, i.e. the end of the universe, or are we going to see that the edge of space and infinity are still out of our reach? I think we are still expanding. Not the universe, simply, but our understanding of it. I think, also, that there is no end to it.