[Centmo]

Also, when comparing the deep field images I don't think it can be stressed enough the difference in exposure time between HST and JWST images (Hubble had a 10x longer exposure time). Many many more distant galaxies would become visible in the JWST image with the much longer exposure time. I look forward to seeing some long-exposure deep field images from JWST!

[kibwen]

This is underappreciated. Much lamentation has been made of the fact that JWST's current mission length is only ten years (maybe twenty or thirty at best, but hard-limited by on-board coolant), but with the speed of its observations that ten years will be as productive as a century of Hubble time.

[MichaelZuo]

It's difficult to imagine how more detailed the JWST images could be if they used the same observation time as the Hubble images.

Will there be thousands of additional extremely red shifted galaxies?

[antisthenes]

With a 10x observation time, you would probably be approaching a uniform cosmic background of multitudes of galaxies.

There would be negligible space without a light emitter.

> Will there be thousands of additional extremely red shifted galaxies?

Yes, and also those that were too faint, but not necessarily extremely red-shifted.