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.
Keywords from Image Description:
JohannGottfriedGalle. Johann Gottfried Galle german astronomer first to look at Neptune Johann Gottfried Galle Johann Gottfried Galle Johann Gottfried Galle Johann Gottfried Galle Johann Gotfried Galle Johann Gottfried Galle Johann Gottfried Galle Germany org unknown Public Domain PDold Johann Gottfried Galle Galle