... a skeleton to hold the optics, instruments, and spacecraft systems in place. To hold the optics, the HST has a truss system, which is made of the material graphite epoxy resin, like tennis racquets and golf clubs. The truss is 17.5 feet (5.3 meters) long, 9.6 feet (2.9 meters) wide and weighs 252 lbs (114 kilograms). The tube that holds the optics and scientific instruments is ... at the nearby Space Telescope Science Institute in Baltimore then analyze the data. Most of the time, commands are transmitted to the HST in advance of a planned observing run; however, real-time commands are ...

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