![](http://www.alamy.com/thumbs/6/8EE112F2-86AF-4B86-96C6-3795C72CE099/E8J1XE.jpg)
Spacelab employed a modular system of pallets and even an Instrument Pointing System that aimed instruments toward the Earth, su
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Keywords: center, challenger, flig, flight, instrument, ips, marshall, nasa, pointing, shuttle, space, spacelab, sts-51f, system