How did humans figure out the age of the earth?
One of Holmes' students, a young man named Clair Patterson, began a project in 1948 to determine the ultimate age of the Earth once and for all. The problem at this point was not with the dating method; the problem was finding the right thing to date. In order to have the final word on the matter, you needed to date the oldest rock on the planet. How would you know when you found it? Patterson found a way around this. Instead of dating something in the ground, he dated something from the sky—a meteorite.