The universe spans an estimated 93 billion light-years. It contains an estimated two trillion galaxies, a trillion trillion solar systems, and eight or nine trillion trillion planets. There is no reason to believe that life exists anywhere other than our very own earth.
Life may well exist on other planets throughout the vast cosmos. But there is no reason to believe that it does. The sheer immensity of the universe does not imply the likelihood of extraterrestrial life. In order to ascertain a probability, one must know something about the subject. And when it comes to the origin of life, we know precisely nothing.
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