A minimum significant variation in some physical constants would render human life on Earth. There are some constants in the universe on which some scientists agree that if there was variation in them would make life impossible.
What are some of these parameters?
1) The electromagnetic force (by which electrons are rejected) compared with the force of gravity (which are attracted) exceeds a value of 1042 but if the value of this force will change to 1041 or human life to 1043 had not appeared.
2) The value of the strong nuclear force is 137 times stronger than the electromagnetic force, if this issue vary considerably human life would not exist.
3) The density of the universe. The visible mass of the universe is 1056 grams. If off mass of 1055 or of 1057 there would be no human life.
4) The relationship between the Sun, Earth and Moon. A substantial change in the mass of the Sun prevent life on Earth. Earth without the Moon would be uninhabitable, as the latter remains in equilibrium at 23'5 ° tilt of the Earth as it rotates on its axis. A variation on this and there would be no seasons, the sun's heat is not distributed equally, would burn part of the Earth and some is frozen.
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