|
| 1 |
Gravitational coupling constant |
If
larger: |
No
stars less than 1.4 solar masses, hence short stellar life spans |
| If
smaller: |
No
stars more than 0.8 solar masses, hence no heavy element production |
| 2 |
Strong nuclear force coupling constant |
If
larger: |
No
hydrogen; nuclei essential for life are unstable |
| If
smaller: |
No
elements other than hydrogen |
| 3 |
Weak nuclear force coupling constant |
If
larger: |
All
hydrogen is converted to helium in the big bang, hence too much heavy
elements |
| If
smaller: |
No
helium produced from big bang, hence not enough heavy elements |
| 4 |
Electromagnetic coupling constant |
If
larger: |
No
chemical bonding; elements more massive than boron are unstable to
fission |
| If
smaller: |
No
chemical bonding |
| 5 |
Ratio of protons to electrons formation |
If
larger: |
Electromagnetism
dominates gravity preventing galaxy, star, and planet formation |
| If
smaller: |
Electromagnetism
dominates gravity preventing galaxy, star, and planet formation |
| 6 |
Ratio of electron to proton mass |
If
larger: |
No
chemical bonding |
| If
smaller: |
No
chemical bonding |
| 7 |
Expansion rate of the universe |
If
larger: |
No
galaxy formation |
| If
smaller: |
Universe
collapses prior to star formation |
| 8 |
Entropy level of universe |
If
larger: |
No
star condensation within the proto-galaxies |
| If
smaller: |
No
proto-galaxy formation |
| 9 |
Mass density of the universe |
If
larger: |
Too
much deuterium from big bang, hence stars burn too rapidly |
| If
smaller: |
No
helium from big bang, hence not enough heavy elements |
| 10 |
Age of the universe |
If
older: |
No
solar-type stars in a stable burning phase in the right part of the
galaxy |
| If
younger: |
Solar-type
stars in a stable burning phase would not yet have formed |
| 11 |
Initial uniformity of radiation |
If
smoother: |
Stars,
star clusters, and galaxies would not have formed |
| If
coarser: |
Universe
by now would be mostly black holes and empty space |
| 12 |
Average distance between stars |
If
larger: |
Heavy
element density too thin for rocky planet production |
| If
smaller: |
Planetary
orbits become destabilized |
| 13 |
Solar luminosity |
If
increases too soon: |
Runaway
green house effect |
| If
increases too late: |
Frozen
oceans |
| 14 |
Fine structure constant* |
If
larger: |
No
stars more than 0.7 solar masses |
| If
smaller: |
No
stars less then 1.8 solar masses |
| 15 |
Decay rate of the proton |
If
greater: |
Life
would be exterminated by the release of radiation |
| If
smaller: |
Insufficient
matter in the universe for life |
| 16 |
12C to 16O energy level ratio |
If
larger: |
Insufficient
oxygen |
| If
smaller: |
Insufficient
carbon |
| 17 |
Decay rate of 8Be |
If
slower: |
Heavy
element fusion would generate catastrophic explosions in all the stars |
| If
faster: |
No
element production beyond beryllium and, hence, no life chemistry
possible |
| 18 |
Mass difference between the neutron and the proton |
If
greater: |
Protons
would decay before stable nuclei could form |
| If
smaller: |
Protons
would decay before stable nuclei could form |
| 19 |
Initial excess of nucleons over anti-nucleons |
If
greater: |
Too
much radiation for planets to form |
| If
smaller: |
Not
enough matter for galaxies or stars to form |
| 20 |
Galaxy type |
If
too elliptical: |
Star
formation ceases before sufficient heavy element buildup for life
chemistry |
| If
too irregular: |
Radiation
exposure on occasion is too severe and/or heavy elements for life
chemistry are not available |
| 21 |
Parent star distance from center of galaxy |
If
farther: |
Quantity
of heavy elements would be insufficient to make rocky planets |
| If
closer: |
Stellar
density and radiation would be too great |
| 22 |
Number of stars in the planetary system |
If
more than one: |
Tidal
interactions would disrupt planetary orbits |
| If
less than one: |
Heat
produced would be insufficient for life |
| 23 |
Parent star birth date |
If
more recent: |
Star
would not yet have reached stable burning phase |
| If
less recent: |
Stellar
system would not yet contain enough heavy elements |
| 24 |
Parent star mass |
If
greater: |
Luminosity
would change too fast; star would burn too rapidly |
| If
less: |
Range
of distances appropriate for life would be too narrow; tidal forces
would disrupt the rotational period for a planet of the right distance;
uv radiation would be inadequate for plants to make sugars and oxygen |
| 25 |
Parent star age |
If
older: |
Luminosity
of star would change too quickly |
| If
younger: |
Luminosity
of star would change too quickly |
| 26 |
Parent star color |
If
redder: |
Photosynthetic
response would be insufficient |
| If
bluer: |
Photosynthetic
response would be insufficient |
| 27 |
Supernovae eruptions |
If
too close: |
Life
on the planet would be exterminated |
| If
too far: |
Not
enough heavy element ashes for the formation of rocky planets |
| If
too infrequent: |
Not
enough heavy element ashes for the formation of rocky planets |
| If
too frequent: |
Life
on the planet would be exterminated |
| 28 |
White dwarf binaries |
If
too few: |
Insufficient
fluorine produced for life chemistry to proceed |
| If
too many: |
Disruption
of planetary orbits from stellar density; life on the planet would be
exterminated |
| 29 |
Surface gravity (escape velocity) |
If
stronger: |
Atmosphere
would retain too much ammonia and methane |
| If
weaker: |
Planet's
atmosphere would lose too much water |
| 30 |
Distance from parent star |
If
farther: |
Planet
would be too cool for a stable water cycle |
| If
closer: |
Planet
would be too warm for a stable water cycle |
| 31 |
Inclination of orbit |
If
too great: |
Temperature
differences on the planet would be too extreme |
| 32 |
Orbital eccentricity |
If too great: |
Seasonal
temperature differences would be too extreme |
| 33 |
Axial tilt |
If
greater: |
Surface
temperature differences would be too great |
| If
less: |
Surface
temperature differences would be too great |
| 34 |
Rotation period |
If
longer: |
Diurnal
temperature differences would be too great |
| If
shorter: |
Atmospheric
wind velocities would be too great |
| 35 |
Gravitational interaction with a moon |
If
greater: |
Tidal
effects on the oceans, atmosphere, and rotational period would be too
severe |
| If
less: |
Orbital
obliquity changes would cause climatic instabilities |
| 36 |
Magnetic field |
If
stronger: |
Electromagnetic
storms would be too severe |
| If
weaker: |
Inadequate
protection from hard stellar radiation |
| 37 |
Thickness of crust |
If
thicker: |
Too
much oxygen would be transferred from the atmosphere to the crust |
| If
thinner: |
Volcanic
and tectonic activity would be too great |
| 38 |
Albedo (ratio of reflected light to total amount falling on
surface) |
If
greater: |
Runaway
ice age would develop |
| If
less: |
Runaway
green house effect would develop |
| 39 |
Oxygen to nitrogen ratio in atmosphere |
If
larger: |
Advanced
life functions would proceed too quickly |
| If
smaller: |
Advanced
life functions would proceed too slowly |
| 40 |
Carbon dioxide level in atmosphere |
If
greater: |
Runaway
greenhouse effect would develop |
| If
less: |
Plants
would not be able to maintain efficient photosynthesis |
| 41 |
Water vapor level in atmosphere |
If
greater: |
Runaway
greenhouse effect would develop |
| If
less: |
Rainfall
would be too meager for advanced life on the land |
| 42 |
Ozone level in atmosphere |
If
greater: |
Surface
temperatures would be too low |
| If
less |
Surface
temperatures would be too high; there would be too much uv radiation at
the surface |
| 43 |
Atmospheric electric discharge rate |
If
greater: |
Too
much fire destruction would occur |
| If
less: |
Too
little nitrogen would be fixed in the atmosphere |
| 44 |
Oxygen quantity in atmosphere |
If
greater: |
Plants
and hydrocarbons would burn up too easily |
| If
less: |
Advanced
animals would have too little to breathe |
| 45 |
Oceans to continents ratio |
If
greater: |
Diversity
and complexity of life-forms would be limited |
| If
smaller: |
diversity
and complexity of life-forms would be limited |
| 46 |
Soil materializations |
If
too nutrient poor: |
diversity
and complexity of life-forms would be limited |
| If
too nutrient rich: |
Diversity
and complexity of life-forms would be limited |
| 47 |
Seismic activity |
If
greater: |
Too
many life-forms would be destroyed |
| If
less: |
Nutrients
on ocean floors (from river runoff) would not be recycled to the
continents through tectonic uplift |
| *(A function of three other
fundamental constants, Planck's constant, the velocity of light, and
the electron charge each of which, therefore, must be fine-tuned) |