Posted by **m** on Sunday, November 21, 2010 at 2:54pm.

How old are the oldest meteorites yet studied and what is the minimum age of Earth since Earth is at least as old as the meteorites.

We know the oldest meteorites contain equal amounts of uranium 238 and lead 206. Uranium 238 has a half life of 4.5 billion years.

Would that mean that the answer would be 9 billion years which is double the half life? Not sure how to figure this one out.