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Drake Equasion

  1. Jan 29, 2004 #1

    Drake Equasion Solved...

    Drake Equasion:
    [tex]N_c = R_0 f_p n_e f_1 f_i f_c L_t[/tex]

    [tex]N_c = \frac{R_0 f_p n_e f_1 f_i f_c N_s}{R_e}[/tex]

    [tex]N_u = N_g R_0 f_p n_e f_1 f_i f_c L_t[/tex]

    [tex]N_u = \frac{N_g R_0 f_p n_e f_1 f_i f_c N_s}{R_e}[/tex]

    R0 = 4 stars*yr^-1
    fp = (105/145)
    ne = (1/105)
    f1 = (1/128)
    fi = (1/13.6*10^6)
    fc = 1
    Ns = 13.6*10^6 global species
    Re = 8.76*10^3 species*yr^-1 (hr^-1)
    Lt = (Ns/Re) = 1552.511 yrs

    Ng = 1.425*10^7 galaxies/Universe

    (Re = hr^-1):
    Nc = 2.436*10^-8 civilizations/galaxy
    Nc^-1 = 4.103*10^7 galaxies/civilization
    Nu = (Nc* Ng) = 0.347 civilizations/Universe

    (Re = dy^-1):
    Nc = 5.848*10^-7 civilizations/galaxy
    Nc^-1 = 1.709*10^6 galaxies/civilization
    Nu = (Nc* Ng) = 8.337 civilizations/Universe

    (Re = mo^-1):
    Nc = 1.778*10^-5 civilizations/galaxy
    Nc^-1 = 5.621*10^4 galaxies/civilization
    Nu = (Nc*Ng) = 253.584 civilizations/Universe

    (Re = yr^-1):
    Nc = 2.134*10^-4 civilizations/galaxy
    Nc^-1 = 4684.615 galaxies/civilization
    Nu = (Nc* Ng) = 3043.017 civilizations/Universe

    Extra-civilization Range:
    [tex]r_c = \sqrt[3]{ \frac{3 V_u}{4 \pi N_u} }[/tex]

    (Re = hr^-1):
    rc = 25.060 BLy

    (Re = dy^-1):
    rc = 8.687 BLy

    (Re = mo^-1):
    rc = 2.783 BLy

    (Re = yr^-1):
    rc = 1.215 BLy

    Nc - civilizations/galaxy
    Nu - civilizations/Universe
    R0 - galaxy stellar formation rate
    fp - stellar planetary fraction
    ne - planetary bioecology
    f1 - bioecological genesis
    fi - Intelligence fraction
    fc - Intelligence communication
    Ns - total global species population
    Re - total global species extinction rate
    Lt - global extinction lifetime


    All non-observable values rejected.


    Reference:
    http://www.obspm.fr/encycl/catalog.html
     
    Last edited: Jan 30, 2004
  2. jcsd
  3. Jan 30, 2004 #2

    Labguy

    User Avatar
    Science Advisor

    "How many alien civilizations are capable of contacting us? In 1961, radio astronomer Frank Drake presented an equation designed to estimate that number on the basis of seven assumptions. For now, the Drake Equation tells you more about your own views on life in the universe than about scientific fact."

    Reference:
    http://www.msnbc.com/modules/drake/default.asp

    The "Drake Equation" was based on assumptions made by one man. Anyone else can make assumptions, but mine would be no more or less "accurate" than Drake's. With the key word being assumption, there is so much to be variable that I don't think that it actually deserves to be called an equation. If it is assumptions, there is no equation to solve. Just my current opinion.
     
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