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.
Sternfeld Lecture Sorbonne Invitation . en The invitation to the lecture delivered by Sternfeld Some new approaches to the astronautics Sorbonne May ru Cczero Ary Sternfeld
Page 2023 Free-images.com. All images are Public Domain