2. To create an extraterrestrial civilization, you need an inhabitable planet. Criterion 1 : Close but not to close to a sun-like star; so that the temperature is between 0-80 0 C. There are as many as 100 billions of stars in our galaxy. r

3. Criterion 2 : The right mass for trapping an atmosphere 6400Km 100Km

4. Criterion 3 : Water! Water! Water! A strike on Moon by NASA last Friday have shown the existence of water . Dry water channels on Mars

5. Why water matters? energy CO 2 Fuel cell electricity Food!

6. What about life?

7. 地球生命的緣起之探索： Miller 實驗 1953 模仿磐古大氣 模仿磐古海洋

8. 生命的分子：氨基酸 Amino Acid Miller 實驗： 1953 產生 5 種， 2007 產生 22 種。 大自然中有 22 種，生物體中有 20 種。 氨基酸序列 - 蛋白質

9. Can we meet each other? - The odd of getting a message from ET http://www.youtube.com/watch?v=kNAUR7NQCLA the introducing scene of Contact (1997)

10. SETI : S earch for E xtraTerrestrial I ntelligence 無線電波的增加地球在宇宙間的可視度 100 光年

11. 不斷擴張 終於可以讓人知道我的存在

12. 假設 Kennedy 沒處理好「古巴危機」 42 光年 1905 1945 1962

13. 稍縱即失 當無線電薄殼通過時對方正好有無線電科技才能知道我的存在

14. Are aliens good or evil? Benign or malignant? http://www.youtube.com/watch?v=mYCBgSRNjk0 alien landing, close encounters of the 3rd kind (1977) Good

15. Are aliens good or evil? Benign or malignant? http://www.youtube.com/watch?v=-c0Myr_sYsE A trailer of War of the Worlds (2005) Evil

16. Are aliens good or evil? Benign or malignant? http://www.youtube.com/watch?v=ojhGdRSkiUw A trailer of Alien (1979) Neither

17. 2001 (1968) http://www.youtube.com/watch?v=c1IPrx-zC1Y Passage through a wormhole Contact (1997) http:// www.youtube.com/watch?v =-ZhvBkrq6rU&feature=related

19. 當發覺他們有不良意圖時，先發制人 遭受攻擊盡可能不反擊，保持極大克制 絕不主動攻擊，但受到攻擊會積極反擊 外星人不善不惡，但會自我防衛 外星人是邪惡的 外星人是善良的