on the Hubble Space Telescope (HST), shown as a simple schematic in the diagram above (click to enlarge.) The first spacewalk began this morning and will replace the WFC2 - in yellow - with the WFC3, exchanging the old camera with a considerably more capable panchromatic imager.Watch the extravehicular activity on NASA-TV. By the way, the junior spacewalker has degrees in geology and geophysics.
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