# 外星生物

## 太陽系內

• 火星表面底下嘅一啲空洞（火星因為缺乏磁場，所以表面受好強嘅輻射照射，不過呢啲地底空洞理論上受到岩石嘅保護，輻射會冇咁勁[3]）、
• 金星大氣層上層（金星大氣層極厚，造成嚴重嘅溫室效應，所以金星表面日頭閒閒地成攝氏 400 幾度咁熱，不過大氣層上層嘅環境會好啲[4]）、同埋
• 氣體大行星－尤其係木星土星－嗰啲冰凍衞星嘅[5][6]，例如有深測器顯示，土星嘅衞星土衞二（Enceladus）似乎有內熱，即係話佢雖然離太陽遠，但有一定嘅熱能，所以表面底下有一個處於液體狀態嘅海（即係話有對生命嚟講好重要嘅），俾廿一世紀初嘅科學界認為有可能有類似地球上噉嘅生命[7]

... 等等。

## 太陽系外

### 德里克公式

${\displaystyle N=R_{*}\cdot f_{\mathrm {p} }\cdot n_{\mathrm {e} }\cdot f_{\mathrm {l} }\cdot f_{\mathrm {i} }\cdot f_{\mathrm {c} }\cdot L}$ ，當中
N = 銀河系當中有可能同人通訊嘅文明嘅數量；
R = 銀河系當中恆星產生嘅率（呢個數字極大）
fp = 一粒恆星會有行星嘅機會率
ne = 每粒有行星嘅恆星平均有幾多粒能夠容納生命嘅行星
fl = 一粒能夠容納生命嘅行星有幾大機會會真係有生命出現
fi = 一粒有生命嘅行星有幾大機會會有有智能嘅生命出現，並且出現文明
fc = 一個文明有幾大機會會開發到能夠向太空傳達資訊嘅科技
L = 一個高科技文明將可探測嘅訊號傳去太空所需嘅時間

## 攷

1. Race, Margaret S.; Randolph, Richard O. (2002). "The need for operating guidelines and a decision making framework applicable to the discovery of non-intelligent extraterrestrial life". Advances in Space Research. 30 (6): 1583–91.
2. Schulze-Makuch, Dirk; Dohm, James M.; Fairén, Alberto G.; Baker, Victor R.; Fink, Wolfgang; Strom, Robert G. (December 2005). Venus, Mars, and the Ices on Mercury and the Moon: Astrobiological Implications and Proposed Mission Designs. Astrobiology. 5. pp. 778–95.
3. How bad is the radiation on Mars?. Phys.org.
4. Singh, D. (2019). Venus nightside surface temperature. Scientific Reports, 9(1), 1-5.
5. Cruz, Maria; Coontz, Robert (2013). "Exoplanets - Introduction to Special Issue". Science. 340 (6132): 565.
6. Selis, Frank (2006). "Habitability: the point of view of an astronomer". In Gargaud, Muriel; Martin, Hervé; Claeys, Philippe. Lectures in Astrobiology. 2. Springer. pp. 210–14.
7. Lineweaver, Charles H.; Fenner, Yeshe; Gibson, Brad K. (January 2004). "The Galactic Habitable Zone and the age distribution of complex life in the Milky Way". Science. 303 (5654): 59–62.
8. Burchell, M.J. (2006). "W(h)ither the Drake equation?". International Journal of Astrobiology. 5 (3): 243–250.
9. Vakoch, Douglas A.; Dowd, Matthew F., eds. (2015). The Drake Equation: Estimating the Prevalence of Extraterrestrial Life Through the Ages. Cambridge, UK: Cambridge University Press.