1904 and rutherford and radiometric dating
" In the 1920s the new theory of continental drift became the great scientific conundrum, and most geologists were unable to accept the concept due to the lack of a mechanism for driving the continents around the globe.
They are both integral to our way of thinking about the world.
To reach back further in time, we needed a place of the same age, but undisturbed by plate tectonics, like the moon.
The oldest rocks we’ve found there date to around 4 and a half billion years.
It was not until the 1950s that the age of the Universe was finally revised and put safely beyond the age of the Earth, which had at last reached its true age of 4.56 billion years.
Physicists suddenly gained a new respect for geologists!