Why life is possible only on the Earth

There are numerous amount of palnets in the milky way Galaxy and we don't have the technology to be 100% sure there is no other planet that humans can't survive on

Timing

Reasonable period of stability without asteroid attacks or fatal phenomenastroid

Excellent Location

Size of the sun

Too big it would burn out swiftly however It has a suitable size to radiate to radiat its heat and still take billions of years to burn out

Perfect distance from the sun

Not too close to turn earth to inferno

Not too far to turn into an ice cube

Big relevance to venus

Helps to determine complications if we were nearer to the sun

Extremely high temperature due to the green house effect

The right kind of planet

Molten Core

Atmosphere

Magnetic Field

protection from cosmic radiation

Plate Tectonics

Ocean,Mountains,Land

Suitable Proportions of elements

92 elements including

Elements that create life

Aluminum

Carbon

oxygen

other elements that sustain life

Abundance

Utilities

Ease of detection

Importance

Unnaturally occuring abundance

Tolerance

Twin Planet

Moon

relatively smaller than the Earth

Maintain earth spinning at right speed and angle

Physical Limitations

Pressure

Collapse of lungs and veins

Due to compression of gases

Experimentations

Dragged by weight

Maximum depth 236 ft

Humans in diving vessels

The "Bends"

Trapped nitrogen buubles within the human blood vessels that may be fatal under pressure

Observation

Coal mine workers

tingling

pain in joints

Itchy skin

Paralysis

Death

Champagne

Failing to fizz in compressed air

Trails to overcome "bends"

Experience very short period of pressure exposures

Dive by careful stages

Lack of adaptations

Hot conditions

Feeling delirious

Keel over for several hours

Cold conditions

Inability to sustain heat that we generate

Only 12% of land suitable for human servival

Limtation of discoveries

The "Squeeze"

being squashed under water pressure when the surface pumps fail within diving suits

Extreme Danger in extreme expermintaion

Haldane

Father

Test altitute sickness in climbers

Problems of heart strokes in deserr regions

Effect of toxic gases on humans

Son

Experminents using "Pressure Pot"

Extremely Hazardous

Crushed vertebrae

Collapsed lungs

Perforated eardrums

Nitrogen Intoxication

Mood swings

Lose of muscle control