This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Galileo Donato. Galileo Galilei displaying his telescope to Leonardo Donato astro unipd it html Detouche circa PDold Galileo Galilei Leonardo Don Henry Detouche
Page 2023 Free-images.com. All images are Public Domain