#2217 - Brian Cox

5775.977 - 5796.967 Brian Cox

It's interesting that you can look at, we can measure the age of the Earth, right? And you measure it from geological processes, radioactive dating and so on, and you can kind of measure the age of the Earth. You can measure the age of the sun in a different way. You can measure it by looking at what's called helioseismology. So you can measure how much helium is in the core of the sun.