How many galaxies exist out there? How many stars? How many planets? Billions upon billions, apparently.

Of all of those myriad worlds, how many boast life?

C.S. Lewis pondered that subject in an essay entitled “Religion and Rocketry.” He said that either result—an absence of life, or an abundance of living creatures throughout the cosmos—can be used by atheists to deny the existence of our Creator.

In my time I have heard two quite different arguments against my religion put forward in the name of science. When I was a youngster, people used to say that the universe was not only not friendly to life but positively hostile to it.

Life had appeared on this planet by a millionth chance, as if at one point there had been a breakdown of the elaborate defenses generally enforced against it. We should be rash to assume that such a leak had occurred…