Numismatics is the study of:

River Danube rises in the Black Forest mountains of western Germany and flows for some 1,770 miles (2,850 km) to its mouth on the Black Sea. The Danube is Europe’s second-longest river after the Volga, passes through 10 countries.

Japan (HALCA) become the first country launched radio telescope satellite into space. Japan on February 12, 1997, launched HALCA, also called VSOP, Muses-B, or Haruka (meaning far away) led by Japan’s Institute of Space and Astronautical Science.