This assumption think that all of the Earth and the moons are the nebulas which floats in the solar systems through revolving and absorbing to accumulate and become a starbody in the meantime.
这一假设认为,地球和月球都是太阳系中浮动的星云,经过旋转和吸积,同时形成星体。
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The standard theory of planet formation holds that no planet that large could be formed so close to a star, leading to the suggestion that the body is a companion star.