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3. SO WHY IS SATELLITE BEING PUT INTO ORBIT? NOT TO GET CLOSER TO SOURCES... -> γ-RAYS DON'T MAKE IT TO SURFACE THRU ATMOSPHERE -> STS-LAUNCH STACK = STS -> CREW (5) GRO in PLB ONLY AIRPLANE MAKES IT TO ORBIT ALL THE REST IS FUEL TO GET IT THERE (TOTAL WT ~ 2 x 10^6 Kg STS ~ 100,000 Kg) <- ~5% FUEL IN 2 FORMS SRB's -> SOLID (LIKE ERASER) -> MOST THRUST [[crossed-out]] [[?]] [[\crossed-out]] ET -> LOX + LH_2 17" pipe into shuttle + into SSME's (3) (engines only burn while tank is on) -> start tape ATLANTIS (1 of 3 COLUMBIA DISCOVERY) CREW ENTERS ~ 2 hrs before