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I agree with your comment concerning life on other planets that we're unable to see. If we can't see it, it will make it that much harder to search for these organisms. However, if life does exist on other planets, then hopefully these same organisms will evolve into something that the human eye can see just as humans evolved in the same manner millions of years before. But who knows maybe we'll never be able to see or discover life on other planets because these living organisms will remain in their same state that is invisible to the human eye.