Abstract
This concluding chapter shows practically that planetary defense is not about securing the mere absence of threat. Deflecting asteroids does not necessarily require its own dedicated technology.
Quite the contrary, planetary defense can and should be approached as a civilian and scientific endeavor with historical importance. This will be challenging, but if we can build a laser capable of sending nanoprobes to the nearest stars at 20% light speed and use the same installation for possible asteroid deflection, then we should not need to rely on militarily oriented planetary defense by a leading nation.
In this chapter, we discuss the associated challenges and required technologies, and also that our community of fate can become a security community-a community in which we do not perceive one another as enemies but as allies. We explain the science of Moon survival and structures for the multipurpose lunar base, as well as the main issues of building a super powerful laser on the Moon.
The same installation can be built on Earth if we can reach a breakthrough in global governance. The chapter ends by discussing the notion that planetary defense is not national defense.