Would rocks on Mars detract from the special snowflake? Mars isn't all that different than earth. Both are in/near a Goldilocks zone around a stable star. Both are of similar size/makeup. And there has been not-insubstantial transfer of material between the two, suggesting the possibility that 'life' started on one and was transfered to the other. But life on a distant star would be truly unique and independent, properly shattering the snowflake.