How Large is the Universe
thingiverse
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/
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