Why should mankind explore space? Why should money, time and efforts be spent exploring and 1 for something with so few apparent benefits? Why should many resources be spent on space 2 than on conditions and people on Earth?
These are questions that, understandably, are very often asked. Perhaps the best answer 3 in our genetic makeup（基因构成）as human beings. What4 our ancestors to move from the trees into the plains. and on into all 5 areas and environments? The wider the 6 spread of a species, the better its chance of 7 . Perhaps the best reason for exploring space is this genetic tendency to expand 8 possible.
Nearly every successful civilization has 9 , because by doing so, any dangers in surrounding areas can be identified and prepared for. Without knowledge, we may be 10 destroyed by the danger. With knowledge, we can 11 its effects.
Exploration also allows minerals and other potential（潜在的）resources 12 . Even if we have no 13 need of them, they will perhaps be useful later. Resources may be more than physical possessions. Knowledge or techniques 14 through exploration. The techniques may have medical applications which can 15 the length or quality of our lives.
