The Solar & Heliospheric Observatory (SOHO) satellite, launched on December 2, 1995, is a cooperative project of the European Space Agency (ESA) and the U.S. National Aeronautics and Space Administration (NASA). The satellite was built by Europe and launched by the United States. Its day-to-day operations are controlled at NASA's Goddard Space Flight Center in Maryland. NASA's global Deep Space Network of large radio antenna dishes tracks the spacecraft.
Ultraviolet light images captured by the Extreme-ultraviolet Imaging Telescope (EIT) aboard SOHO help us understand what is happening on the Sun from day to day.The numbers 171, 195, 284 and 304 refer to the extreme ultraviolet light wavelength in Angstroms. [Click any of the upper images below for more images]