Life is a tenuous thing. Earth is just within Sol’s habitable zone, and constantly pelted with solar radiation and cosmic rays. Rocky scraps of cosmic afterbirth constantly cross Earth’s orbit, threatening to eradicate all terrestrial life. In point of fact, it is almost certain that countless Extinction-Level Events would have sterilized the surface of our plucky planet had it not been for our constant companion and benefactor; a body which unwittingly wards away many of the ills that could befall us: the moon.Luna is unique among the observed celestial bodies; there is no other satellite closer in size and composition to its mother-planet (if one discounts the dwarf-planet Pluto), and the Earth/moon system is the only tidally locked pair. Furthermore, it also happens to be the only moon in the solar system which is circling an intelligent civilization– a factor which may not be a mere coincidence.
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