© 2001 Reasons To Believe
An Estimate of the Probability for Attaining the Necessary Parameters for Life Support1-85
Probability that feature will
|local abundance and distribution of dark matter||0.1|
|relative abundances of different exotic mass particles||0.1|
|decay rates of different exotic mass particles||0.1|
|galaxy cluster size||0.1|
|galaxy cluster location||0.1|
|galaxy mass distribution||0.2|
|variability of local dwarf galaxy absorption rate||0.1|
|quantity of galactic dust||0.1|
|star location relative to galactic center||0.2|
|star distance from corotation circle of galaxy||0.005|
|star distance from closest spiral arm||0.1|
|z-axis extremes of star’s orbit||0.02|
|proximity of solar nebula to a type I supernova eruption||0.01|
|timing of solar nebula formation relative to type I supernova eruption||0.01|
|proximity of solar nebula to a type II supernova eruption||0.01|
|timing of solar nebula formation relative to type II supernova eruption||0.01|
|timing of hypernovae eruptions||0.2|
|number of hypernovae eruptions||0.1|
|flux of cosmic ray protons||0.1|
|variability of cosmic ray proton flux||0.1|
|number of stars in birthing cluster||0.01|
|star formation history in parent star vicinity||0.1|
|birth date of the star-planetary system||0.01|
|number of stars in system||0.7|
|number and timing of close encounters by nearby stars||0.01|
|proximity of close stellar encounters||0.1|
|masses of close stellar encounters||0.1|
|ratio of 40K, 235,238U, 232Th to iron in star-planetary system||0.02|
|star orbital eccentricity||0.1|
|star luminosity change relative to speciation types & rates||0.00001|
|star magnetic field||0.1|
|star magnetic field variability||0.1|
|stellar wind strength and variability||0.1|
|short period variation in parent star diameter||0.1|
|star’s carbon to oxygen ratio||0.01|
|star’s space velocity relative to Local Standard of Rest||0.05|
|star’s short term luminosity variability||0.05|
|star’s long term luminosity variability||0.05|
|amplitude and duration of star spot cycle||0.1|
|number & timing of solar system encounters with interstellar gas clouds||0.1|
|galactic tidal forces on planetary system||0.2|
|supernovae rates & locations||0.01|
|white dwarf binary types, rates, & locations||0.01|
|structure of comet cloud surrounding planetary system||0.3|
|planetary distance from star||0.001|
|inclination of planetary orbit||0.5|
|axis tilt of planet||0.3|
|rate of change of axial tilt||0.01|
|period and size of axis tilt variation||0.1|
|planetary rotation period||0.1|
|rate of change in planetary rotation period||0.05|
|planetary revolution period||0.2|
|planetary orbit eccentricity||0.3|
|rate of change of planetary orbital eccentricity||0.1|
|rate of change of planetary inclination||0.5|
|period and size of eccentricity variation||0.1|
|period and size of inclination variation||0.1|
|number of moons||0.2|
|mass and distance of moon||0.01|
|surface gravity (escape velocity)||0.001|
|tidal force from sun and moon||0.1|
|rate of change & character of change in magnetic field||0.1|
|albedo (planet reflectivity)||0.1|
|reducing strength of planet’s primordial mantle||0.3|
|thickness of crust||0.01|
|timing of birth of continent formation||0.1|
|rate of change in oceans to continents ratio||0.1|
|global distribution of continents||0.3|
|frequency, timing, & extent of ice ages||0.1|
|frequency, timing, & extent of global snowball events||0.1|
|asteroidal & cometary collision rate||0.1|
|change in asteroidal & cometary collision rates||0.1|
|rate of change in asteroidal & cometary collision rates||0.1|
|mass of body colliding with primordial Earth||0.002|
|timing of body colliding with primordial Earth||0.05|
|location of body’s collision with primordial Earth||0.05|
|position & mass of Jupiter relative to Earth||0.01|
|major planet eccentricities||0.1|
|major planet orbital instabilities||0.05|
|drift and rate of drift in major planet distances||0.05|
|number & distribution of planets||0.01|
|distance of gas giant planets from mean motion resonances||0.02|
|orbital separation distances among inner planets||0.01|
|mass of Neptune||0.1|
|total mass of Kuiper Belt asteroids||0.1|
|atmospheric electric discharge rate||0.01|
|atmospheric temperature gradient||0.01|
|carbon dioxide level in atmosphere||0.01|
|rate of change in carbon dioxide level in atmosphere||0.1|
|rate of change in water vapor level in atmosphere||0.01|
|rate of change in methane level in early atmosphere||0.01|
|oxygen quantity in atmosphere||0.01|
|nitrogen quantity in atmosphere||0.01|
|carbon monoxide quantity in atmosphere||0.1|
|chlorine quantity in atmosphere||0.1|
|cobalt quantity in crust||0.1|
|arsenic quantity in crust||0.1|
|copper quantity in crust||0.1|
|boron quantity in crust||0.1|
|flourine quantity in crust||0.1|
|iodine quantity in crust||0.1|
|manganese quantity in crust||0.1|
|nickel quantity in crust||0.1|
|phosphorus quantity in crust||0.1|
|tin quantity in crust||0.1|
|zinc quantity in crust||0.1|
|molybdenum quantity in crust||0.05|
|vanadium quantity in crust||0.1|
|chromium quantity in crust||0.1|
|selenium quantity in crust||0.1|
|iron quantity in oceans||0.1|
|tropospheric ozone quantity||0.01|
|stratospheric ozone quantity||0.01|
|mesospheric ozone quantity||0.01|
|water vapor level in atmosphere||0.01|
|oxygen to nitrogen ratio in atmosphere||0.1|
|quantity of greenhouse gases in atmosphere||0.01|
|rate of change in greenhouse gases in atmosphere||0.01|
|quantity of forest & grass fires||0.01|
|quantity of sea salt aerosols||0.1|
|quantity of anaeorbic bacteria in the oceans||0.01|
|quantity of aerobic bacteria in the oceans||0.01|
|quantity, variety, and timing of sulfate-reducing bacteria||0.001|
|quantity of decomposer bacteria in soil||0.01|
|quantity of mycorrhizal fungi in soil||0.01|
|quantity of nitrifying microbes in soil||0.01|
|quantity & timing of vascular plant introductions||0.001|
|quantity, timing, & placement of carbonate-producing animals||0.00001|
|quantity, timing, & placement of methanogens||0.00001|
|quantity of soil sulfur||0.1|
|ratio of electrically conducting inner core radius to radius of the adjacent turbulent fluid shell||0.2|
|ratio of core to shell (see above) magnetic diffusivity||0.2|
|magnetic Reynold’s number of the shell (see above)||0.2|
|core precession frequency for planet||0.1|
|rate of interior heat loss for planet||0.01|
|quantity of sulfur in the planet’score||0.1|
|quantity of silicon in the planet’s core||0.1|
|quantity of water at subduction zones in the crust||0.01|
|quantity of high pressure ice in subducting crustal slabs||0.1|
|hydration rate of subducted minerals||0.1|
|rate of decline in tectonic activity||0.1|
|rate of decline in volcanic activity||0.1|
|viscosity at Earth core boundaries||0.01|
|viscosity of lithosphere||0.2|
|biomass to comet infall ratio||0.01|
|regularity of cometary infall||0.1|
|number, intensity, and location of hurricanes||0.02|
dependency factors estimate ≈ 1032
longevity requirements estimate ≈ 1013
Probability for occurrence of all 165 parameters ≈ 10-204
Maximum possible number of planets in universe ≈ 1022
Thus, less than 1 chance in 10182 (hundred trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion trillion) exists that even one such planet would occur anywhere in the universe.
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