From: My Mother, although my Father had some small part.
Well, document, document, document . . .
Unmanned space flight is cheaper, safer but if something unexpected happens a human hand may be needed. But it also depends upon where the mission is, if it is in orbit around the Earth, manned may be better. But eventually, the chest thumping stuff may need to be done. The best way to get to Mars for a manned mission might be using a Lunar base to build the spacecraft and/or supply it.
Seek peace but keep your gun handy.
I'm not a complete idiot, some parts are missing!
“Illegitemus non carborundum est (“Don’t let the bastards grind you down”).”
― Julia Child