探星者

Are we alone in the universe? For over half a century, legendary NASA engineer and best-selling scie[展开全部]

　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.[收起部分]