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Cox is a physicist, they deal especially in the very big and very small. Statistically, he's probably right...the odds of us being alone in the universe is very small, but not impossible.
Likewise, however complex and improbable we believe it to be, what we classify as life has evolved at least once that we know of in an otherwise ordinary environment. Such environments similar to our own must exist many times over in our own galaxy alone, let alone the universe as a whole. What's to say it hasn't happened many times?
And that's all before we consider other possibilities to call life...which we've also discovered right here a home.
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