1991
Cosmic  


Astronomy and astrophysics begin to flourish at previously unexplored wavelength.

Astronomy and astrophysics begin to flourish at previously unexplored wavelength. Astronomers increasingly view the universe at all wavelengths, using orbiting satellites such as the U.S. Gamma Ray Observatory and Extreme Ultraviolet Explorer, the German ROSAT (ROentgen SATellite) and Japanese Yokhoh for X rays; the ESA (European Space Agency) Infrared Space Observatory; and very long baseline arrays, whose antennas are scattered across continents for extremely high resolution radio astronomy.
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