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地球成因在科学界是众说纷纭的,有地球演变说、捕获说、火成说、分离说、冷凝说、碰撞说、收缩说、膨胀说等等。自18世纪以来,科学家们先后提出过40多种假说,但都各持己见,无一不关系到太阳系起源问题。在太阳系形成的理论中,前人的研究主要分为两大类:一类是灾变论,它以太阳偶然获得众行星为由;另一类是演化论,是以整个太阳系有序形成并进行缓慢的演化为据。灾变论在国外是非常时兴的,由于它属于某种巧合物理现象,故以地球碰撞火成说最为典型。该说认为:在46亿年前,数以万计的小行星碰撞于一体产生
The causes of the Earth in the scientific community are controversial, there are evolution of the Earth that capture said that the fire into the said, the separation of said condensation that collisions say contraction said expansion and so on. Since the 18th century, scientists have put forward more than 40 kinds of hypotheses, but all disregard their opinion, which are all related to the origin of the solar system. In the theory of the formation of the solar system, the predecessor’s research is mainly divided into two categories: one is catastrophe theory, which uses the sun to accidentally obtain the grounds of all the planets; the other is the evolution theory, which is based on the orderly formation and conduct of the entire solar system Slow evolution to data. Catastrophe theory is very fashionable in foreign countries, because it belongs to some kind of coincidental physical phenomena, so the collision of the Earth said the most typical fire. The argument is that 4.6 billion years ago, tens of thousands of asteroids collided in one body