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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