Is the “Giant Impact Hypothesis” still considered to be the best explanation for how the moon came into being?

Yes.  The current experiments and modeling efforts predominantly use the giant impact hypothesis as the basis of their studies.  In other words, approximately 4.5 billion years ago, a collision of the early Earth with a Mars-sized object resulted in the formation of the Earth/Moon system.  This model provides answers to the reasons behind the Earth/Moon high-spin system, the low density of the Moon, and lunar composition.  Other hypothesis on lunar formation are that a planetoid (the Moon) was captures in the Earth’s gravity well, or that the Earth and Moon co-formed together through accretion.  Neither of these explanations provide quite the full picture that the giant impact does, however.

Brad Bailey

NLSI Staff Scientist

January 20, 2009

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  • Colonizing the Moon?

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    Mount Holyoke College professor Darby Dyar says it is not fantasy to think humans will colonize the moon in our lifetime.

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The Moon's magnetic field is 100 to 1000 times weaker than the Earth's.

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