Earth Sciences 1086F/G Lecture Notes - Lecture 6: Giant-Impact Hypothesis, Terrestrial Planet, George Darwin
13 Oct 2017
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2: the apollo mission was to answer these hypotheses; instruments were set up through which its interior zonation was determined. Proposed 100 years ago by george darwin (father = charles darwin) Earth spun so fast that in its formation, a bulge developed and a chunk broke off into orbit; this would require earth rotated one every 2. 5 hours rather than 24 hours tho . Both bodies formed at same time from same parent cloud. First evidence would be chemical they must both have same composition but they don"t. The moon has a tiny metallic core compared with earth. Second, would be to find the moon orbits earth exactly on an equatorial planeit doesn"t. The capture hypothesis first, probability for exact gravitational/dynamic conditions needed for an object this big to fall into orbit is unlikely. Second, chemical (oxygen isotopes) were so similar between earth and moon that there had to be some type of genetic" relationship.
