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5. 
SOLAR SYSTEM CLASS ....
HUMAN EXPLORATION of SOLAR SYSTEM
- MOON
- LAUNCH PROBES FROM SHUTTLE
GALILEO (JUPITER)
ULYSSES (SUN)
SCALE of SOLAR SYSTEM  #5 in middle of graph
(+ HOW YOU TRAVEL ...)
Δ ~ 75 X 10^6 KM [[image]] 225 X 10^6 150 X 10^6 KM 
ON THIS SCALE, CAN'T EVEN SEE MOON'S ORBIT 
1/4 M miles (~days)
NO ~ 100 M
~ 300X longer
"ITS A LONG WAYS TO MARS"
ORBITAL MECHANICS (CORRECT RELATIVE POSITION ~ EVERY 2 YRS)
-> ~1 yr there
~1 yr back
PROBLEMS:
1) DESIGN S/C & LIFE SUPPORT TO LAST THAT LONG
2) LAUNCHING & ASSEMBLING IN LEO (#'S?) (> 2M #'S to LEO) (~40 shuttle flight)