What would have happened if the third stage of Saturn V had exploded during TLI? Could the CM have safely returned to earth?
Why does PSLV use four stages to get to LEO, and why do they alternate solid, liquid, solid, liquid?
Function of this big pointy thing on the Titan Transtage? Do other upper stages have something similar?
How rare is it in the 21st century to use five stages to get to LEO, especially for a low-mass payload?
Which is overall more expensive to operate for a final rocket stage? LH2/LOX or hypergolics like UDMH/N2O4?
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