Though I haven't read the article, but if the title suggests that life is limited to what we observe on Earth, then either we are defining life that way (and by definition we would only have it on earth-like objects) or have taken a very narrow view of what life is. Life is a very fuzzy concept, every researcher, every journalist defines it in his own way. Does life have to have carbon? Does it have to wiggle?
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Though I haven't read the article, but if the title suggests that life is limited to what we observe on Earth, then either we are defining life that way (and by definition we would only have it on earth-like objects) or have taken a very narrow view of what life is. Life is a very fuzzy concept, every researcher, every journalist defines it in his own way. Does life have to have carbon? Does it have to wiggle?