How Large is the Universe

This is a way to visualise the size of the universe, and in particular how much of the sky the 'Hubble Ultra Deep Field' picture takes up.
https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field

The Ultra Deep Field is 2.4 arc-minutes wide (0.04 degrees), so it's a tiny slice of sky. In fact you'd need thirteen million exposures just like it to cover the entire sky.

Details and instructions here:
https://tinkerings.org/2017/07/01/how-big-is-the-universe-exploring-the-hubble-ultra-deep-field/