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JWST's "Chassis" Gets Taken Out For A Spin

The centrifuge at NASA's Goddard Space Flight Center, Greenbelt, Md. that will spin the ISIM. Credit: NASA/Chris Gunn. For a larger version of this image please go here.
by Rob Gutro
Greenbelt MD (SPX) Mar 10, 2011
The Integrated Science Instrument Module, or ISIM, is the structural heart of the James Webb Space Telescope, what engineers call the main payload. It will house the four main scientific instruments of the telescope. The ISIM is like a chassis in a car providing support for the engine and other components.

Webb will undergo significant shaking when it is launched on the large Ariane V rocket. To be sure the telescope's "chassis" is ready for this "bumpy road," the ISIM is subjected to some extreme testing. During the testing process, the ISIM is spun and shaken while many measurements are taken.

Afterwards, engineers compare the measurements with their models of the ISIM. If there are discrepancies, then the engineers track down why, and make corrections.

Webb will be the first next-generation large space observatory and will serve thousands of astronomers worldwide.

Designed to detect light from as far away as approximately 14 billion light years, Webb will study every phase in the history of our Universe, ranging from the first luminous glows after the Big Bang, to the formation of planetary systems capable of supporting life on planets like Earth, to the evolution of our own Solar System.

The Webb telescope is a joint mission of NASA, the European Space Agency and Canadian Space Agency.



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The various spiral arm segments of the Sunflower galaxy, also known as Messier 63, show up vividly in this image taken in infrared light by NASA's Spitzer Space Telescope. Infrared light is sensitive to the dust lanes in spiral galaxies, which appear dark in visible-light images. Spitzer's view reveals complex structures that trace the galaxy's spiral arm pattern. Messier 63 lies 37 millio ... read more







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