Are we alone in the universe? For over half a century, legendary NASA engineer and best-selling science fiction author, Gentry Lee, has explored every aspect of this question in the realms of space science, robotic exploration and the human imagination. At age 82, he has come to a revelatory conclusion.
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💬 播放器右下角弹幕输入框可直接发弹幕，弹幕会随播放进度飘过并保存到本集。