Unanswered Questions. In a sense, this entire chapter was about one big, unanswered question: Are we

Unanswered Questions. In a sense, this entire chapter was about one big, unanswered question: Are we alone in the universe? But as we attempt to answer this “big” question, there are many smaller questions that we might wish to answer along the way. Describe one currently unanswered question about life in the universe that we might be able to answer with new missions or experiments over the next couple of decades. What kinds of evidence will we need to answer the question? How will we know when it is answered?

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