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.
GustavWitt. en Gustav Witt pl Gustav Witt de Gustav Witt sammlungen huberlin de Adolf Halwas public domain PDold DEFAULTSORT Witt Astronomers from Germany
Page 2023 Free-images.com. All images are Public Domain