Henry Spencer

“In a small spacecraft, it was hard for the other two guys to sleep when the on-duty man was talking to Mission Control regularly.”

“Historically, the U.S.'s big launchers fly seldom enough that their costs are dominated by annual upkeep of facilities and staff, not by the actual cost of each launch. The expensive part is maintaining the launch capability, not actually conducting launches.”

“Developing expendable rockets is always going to be painful and expensive. Throwing the whole rocket away on each attempt not only costs a lot, it also hampers figuring out just what went wrong because you don't get the rocket back for inspection.”

“The Moon may not be quite as appealing as Mars, but it's still a complex and poorly understood world, with many questions still unanswered.”