That raises an interesting question Mark.
If "life arose" as merely the inevitable result of a combination of physical, chemical and biological factors then it is perfectly reasonable to conclude that life also arose elsewhere as the inevitable result of another combination of physical, chemical and biological factors. Whether that life looks like anything we would recognize is another matter.
If "life arose" as the result of, oh, being spoken into existence by some eternal being (for the sake of brevity I'll give that being a name, "God" will do just fine here) then whether life exists elsewhere would be a matter of whether or not God said "let there be wriggly things that wriggle on some other planet just like the wriggly things that wriggle on planet Earth".
Since we can't prove conclusively whether "life arose" because of a combination of scientific factors or the spoken word of God, it's hard to know which scenario is correct. I guess it's a matter of faith as to which one you believe in