The true cost of space exploration cannot be measured in dollars. It must be measured in human lives. For those who paid the ultimate price, we thank you and salute you. Those who understand the importance of your sacrifice will not forget. Godspeed on your next adventure.
A complex system like Apollo or Space Shuttle is impersonal, amoral. It is indifferent to human objectives, human aspirations, or human lives. Like reality itself, it moves only to its internal agenda.