- TL;DR Summary
- The stars at night are very distant suns.This must have been a great leap in imagination.
The first person to realize the night sky is filled with stars similar to our sun was a great leap in imagination. Cassini in 1672 measured the sun distance by parallax measurement of Mars so I assume he knew. But you didn't have to know the solar distance to speculate that the stars were more distant suns. A sun-centered solar system is helpful. Did Copernicus speculate on this? Did Galileo suggest this? A sun centered solar system was contrary to the Church teaching at the time. I would think that there are thousands of suns would be equally disruptive.