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International Gamma-Ray Astrophysics Laboratory
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International Gamma-Ray Astrophysics Laboratory
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International Gamma-Ray Astrophysics Laboratory
International Gamma-Ray Astrophysics Laboratory Artist's conception of the International Gamma-Ray Astrophysics Laboratory (Integral).

International Gamma-Ray Astrophysics Laboratory

satellite observatory
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Also known as: Integral
Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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International Gamma-Ray Astrophysics Laboratory (Integral), European Space Agency–Russian–U.S. satellite observatory designed to study gamma rays emitted from astronomical objects. Integral was launched by Russia from the Baikonur Cosmodrome in Kazakhstan on October 17, 2002. It carried a gamma-ray imager and spectrometer to study the most-energetic events in the universe; an onboard X-ray monitor and an optical camera were used to provide precise locations of the sources discovered by the gamma-ray instruments. It mapped the sky in the 511-kiloelectron-volt emission line that arises from electron-positron annihilation and found that the emission is concentrated toward the centre of the Milky Way Galaxy. ...(100 of 123 words)

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