THANK GOODNESS FOR the atmosphere. It keeps us warm. Without it, Earth would be alifeless ball of ice with an average temperature of minus 60 degrees Fahrenheit. In addition,the atmosphere absorbs or deflects incoming swarms of cosmic rays, charged particles,ultraviolet rays, and the like. Altogether, the gaseous padding of the atmosphere is equivalentto a fifteen-foot thickness of protective concrete, and without it these invisible visitors fromspace would slice through us like tiny daggers. Even raindrops would pound us senseless if itweren’t for the atmosphere’s slowing drag.

The most striking thing about our atmosphere is that there isn’t very much of it. It extendsupward for about 120 miles, which might seem reasonably bounteous when viewed fromground level, but if you shrank the Earth to the size of a standard desktop globe it would onlybe about the thickness of a couple of coats of varnish.

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