During my father's lifetime, the size of our universe became staggeringly larger when we realized that WE lived in a galaxy -- and those pretty spirally galaxies were much larger and more distant that we thought. Time and distance go back some 13.8 billion years.
Here are two videos of Hubble images showing how vast our universe is, going about halfway back.
I remember seeing the first Hubble Deep Field images in The Chronicle of Higher Education. They pointed Hubble at a seemingly blank bit of sky and built up a image photon by photon over a period of weeks.
In the movie 2001: A Space Odyssey, Dave Bowman famously declares, "My God, it's full of stars."
The Hubble Space Telescope proved that the universe, "is full of galaxies." Each one with hundreds of billions to a trillion stars.
It makes one feel very small. It makes one feel big to be connected to such a stupendous universe.