Is there life elsewhere in the Milky Way
In conclusion, the number of civilizations in our galaxy with which communication might be possible is: 2 * 1 * 0.3 * 0.5 * 0.8 * 0.2 * 10 6 = 48,000 civilizations.
This presents a problem called the Fermi Paradox:
Owing to these calculations, life in our galaxy should be teeming with life, yet we have seen no sign of it . 12
The solution to this could be that life is unique to Earth, and that, as with so much in our galaxy, we just do not know for sure.
Bibliography
Choi, C. (2017) Our Expanding Universe: Age, History & Other Facts | Space . https://www.space.com/52- the-expanding-universe-from-the-big-bang-to-today.html. Consulted: 03/08/19 (2017a) Silicon-Based Life May Be More Than Just Science Fiction. https://www.nbcnews.com/mach/science/silicon-based-life-may-be-more-just-science- fiction-n748266. Consulted: 09/08/19 Cox, B. (2014) Human Universe. London (2016) Universal: A Guide Through The Cosmos. London Graham87. (n.d.) Drake Equation. https://en.wikipedia.org/wiki/Drake_equation. Consulted: 04/08/19 Howell, E. (2018) Fermi Paradox: Where are the aliens ? https://www.space.com/25325-fermi- paradox.html. Consulted: 10/08/19 (2018a) Drake Equation: Estimating the odds of finding E.T. https://www.space.com/25219- drake-equation.html Consulted: 08/08/19 (2018b) Kepler Space Telescope: The Original Exoplanet Hunter. https://www.space.com/24903-kepler-space-telescope.html. Consulted: 06/08/19 Langmuir, C. (1985). How To Build A Habitable Planet. New Jersey Sawyer, P. (n.d.) The Earliest Atmosphere . http://forces.si.edu/atmosphere/02_02_01.html. Consulted: 04/08/19 Tate, J. (2010) Nucleosynthesis. https://www.universetoday.com/51797/nucleosynthesis. Consulted: 05/08/19 Windley, B. (n.d.) Geological History of Earth. https://www.britannica.com/science/geologic-history- of-Earth. Consulted: 03/08/19 Yonezawa, T. (2010) Was the Universal Common Ancestry proved? https://www.nature.com/articles/nature09482 . Consulted: 11/08/19
12 Howell 2018.
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