To promote and safeguard the science of astronomy in all its aspects, including research, communication, education and development, through international cooperation.
Read more...
Allowed file formats are .GIF,.JPG,.PNG,.BMP
The maximum file size allowed is 1 MB
1929 - 2008 Germany
https://en.wikipedia.org/wiki/J%C3%BCrgen_Ehlers https://www.aei.mpg.de/299871/ehlers