regard this world as one of many in the universe Para.15-20 1.What are the characteristics of extraterrestrial life among us? It is intelligent,technological and capable of eluding detection and confirmation.Descriptions of UFOs and ETs make people believe these aliens walk in a jumpy way and they abduct human beings and take them away in flying sauces in the middle of the night 2.True believers and skeptics rarely go over to the other side. Neither those who genuinely believe that space aliens are lurking in our midst nor those who firmly reject such an idea are likely to change their views and join the other side. 3.I think it's fair.stature. "Stature"functions as a pun,implying physical size but also a status worthy of the respect of mainline science. 4.That so many people.extraterrestrial life That clause+is+a reminder Instead of using a verb,such as"show,which many writers would do the author uses "areminder",which reinforces the emphasis on how many people today do not follow mainline science in relation to this subject. 5.The aliens are.with human beings Starting from modern scientific knowledge people try their imaginations to create aliens,but people also borrow from ancient stories to imagine that aliens would like to come to this world and meddle with human beings In other words aliens are the productsof not only moder seience and technoloy but also ancient and folk stories. Paras.21-23 1.The first sentence on Para.21 is a transitional sentence,leading to the Fermi paradox and the four possibilities,and then to the exploration of Mars 2.What is the Fermi paradox? In 1950,Enrico Fermi asked his colleagues a question:Where is everybody?Why haven't space aliens come to Earth?This is the Fermi paradox 3.The alien is a Hollywood.creation The alien is a character used too much in Hollywood films so it has become hackneyed,but the idea of extraterrestrial life was not first brought up by Holywood regard this world as one of many in the universe. Para. 15—20 1. What are the characteristics of extraterrestrial life among us? It is intelligent,technological and capable of eluding detection and confirmation.Descriptions of UFOs and ETs make people believe these aliens walk in a jumpy way and they abduct human beings and take them away in flying sauces in the middle of the night. 2. True believers and skeptics rarely go over to the other side. Neither those who genuinely believe that space aliens are lurking in our midst nor those who firmly reject such an idea are likely to change their views and join the other side. 3. I think it’s fair.stature. “Stature” functions as a pun,implying physical size but also a status worthy of the respect of mainline science. 4. That so many people . extraterrestrial life That clause + is + a reminder Instead of using a verb,such as “show”,which many writers would do,the author uses “a reminder” ,which reinforces the emphasis on how many people today do not follow mainline science in relation to this subject. 5. The aliens are . with human beings Starting from modern scientific knowledge people try their imaginations to create aliens,but people also borrow from ancient stories to imagine that aliens would like to come to this world and meddle with human beings.In other words aliens are the products of not only modern science and technology but also ancient culture and folk stories. Paras. 21—23 1. The first sentence on Para. 21 is a transitional sentence,leading to the Fermi paradox and the four possibilities,and then to the exploration of Mars. 2. What is the Fermi paradox? In 1950,Enrico Fermi asked his colleagues a question: Where is everybody? Why haven’t space aliens come to Earth? This is the Fermi paradox. 3. The alien is a Hollywood . creation The alien is a character used too much in Hollywood films so it has become hackneyed,but the idea of extraterrestrial life was not first brought up by Hollywood