Formation interval, nebula

The time scale for Earth s differentiation was discussed in Chapter 9. We learned that tungsten isotopes constrain the time interval between nebula formation and core separation as less than 30 Myr (Yin et al., 2002). Differentiation must have been complete before the giant impact that formed the Moon, currently constrained to have occurred 40—45 Myr after the solar system formed (Halliday, 2004 and references therein). 

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