Radiometric dating planets

Processed meteorites apparently once were part of a large object that “processed” the original material of the solar nebula into another form.Radiometric dating shows that these meteorites are generally younger than the primitive meteorites.Since 1955 the estimate for the age of the Earth has been based on the assumption that certain meteorite lead isotope ratios are equivalent to the primordial lead isotope ratios on Earth.In 1972 this assumption was shown to be highly questionable.We can get absolute ages only if we have rocks from that surface.For others, all we are doing is getting a relative age, using things like the formation of craters and other features on a surface.The biggest assumption is that, to first order, the number of asteroids and comets hitting the Earth and the Moon was the same as for Mercury, Venus, and Mars. The bottom line is that the more craters one sees, the older the surface is.

For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles and Further Reading below.Most meteorites are difficult to distinguish from terrestrial rocks without detailed scientific analysis.Meteorites are usually covered with a dark, pitted crust resulting from their fiery passage through the atmosphere.These are the surfaces that we can get absolute ages for.For the others, one can only use relative age dating (such as counting craters) in order to estimate the age of the surface and the history of the surface.

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  1. Immediately after he announced to his cheering supporters that the country was ready to end its fractious divisions, Kennedy was shot several times by the 22-year-old Palestinian Sirhan Sirhan. A huge section of the city of Constantinople, Turkey, is set ablaze on this day in 1870.