The nebula would have happened through a very hot starting phase in which all the original material of dust grains would have evaporated. Then, the progressive cooling of this steam would have lead to the condensation of new solid grains, whose composition would be function of the distance to the Sun. North American A.G.W. Cameron could calculate, in 1978, that ha company ” 1 UA, was condensed, well-known minerals good, like hydrous silicates, in those that the H20participa molecule in their formula qumica.(7) These new dust grains were crowded together to each other to form bodies of kilometric size (the plans of whose impacts still they are visible in the Moon); then, its fast accretion in bodies of planetary size released water, in the form of steam, in the surface of the planet, either at the time of the impact, or later by volcanic degassing. Located a little more near the Sun (to 0.95 UA instead of a 1 UA) the Earth it would receive a 10% more of solar energy. The North American Michael Hart could calculate, in 1978, who would warm up itself until the point to suffer the same fate that Venus, by divergent greenhouse effect. Located a little far (a 1.03 UA) sufriria by the conmastrario a freezing that nothing could restrain and, to the Mars way, the oceans would freeze until the bottom.
(“) By analogy with stars of the same type, we know that the energy of the Sun increases in a 1% each one hundred million years. Within thousands million years the solar flow will have increased in a 10% and the liquid water will disappear of the Earth. Without a doubt this problem is not most urgent than it must solve the humanity to be able to survive in his blue planet.
