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• Infrared space observatory (ISO)

  15 Nov 2011

  The satellite made important studies of cool objects in the Universe that emit infrared radiation but no visible light. Infrared radiation is primarily heat, or thermal radiation. Even objects that we think of as being very cold (such as an ice cube) emit infrared radiation.

• International GammaRay astrophysics lab (INTEGRAL)

  15 Nov 2011

  The International Gamma Ray Astrophysics Laboratory (INTEGRAL) is providing new insights into the most violent and exotic objects of the Universe, such as black holes, neutron stars, active galactic nuclei and supernovae. The mission is led by the European Space Agency (ESA) in co-operation with Russia, the United States, the Czech Republic and Poland.

• International ultraviolet explorer (IUE)

  15 Nov 2011

  The International Ultraviolet Explorer (IUE) has been one of the most productive satellites ever built. IUE provided invaluable information about stars located millions of kilometres away as well as objects much closer to home, such as comets approaching our part of the Solar System.