Not long ago scientists didn’t understand about the existence of galaxies. They just saw fuzzy spots everywhere. They thought there was just one galaxy – ours.
But Edwin Hubble, looking through an earth-bound telescope, realized these spots were very far away and moving further away, he realized there might be a lot more going on out there than we’d been thinking about.
The concept of many galaxies was born and so was the idea that ours was just one small one among billions.
The rest of the universe was born to us as a concept unlike previous concepts.