The document discusses the possibility of life existing on other planets and the potential for contact with extraterrestrial civilizations. It outlines three key criteria for habitable planets: proximity to a star like our sun, sufficient mass to retain an atmosphere, and the presence of water. While water has been detected on the moon and Mars, the document does not indicate whether life has been found elsewhere in the universe. It also discusses early experiments that synthesized amino acids, the building blocks of life, and the ongoing Search for Extraterrestrial Intelligence (SETI) project. Potential outcomes for an alien encounter range from benign to hostile contacts, depending on the civilization's level of development and intentions.

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