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For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.Another example is luminescence dating, which measures the energy from radioactive decay that is trapped inside nearby crystals.It is assumed that level of carbon-14 in the atmosphere is constant.We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.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.

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.

We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i.e. We also have meteorites from asteroids and can date them, too.

These are the surfaces that we can get absolute ages for.

This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.

These use radioactive minerals in rocks as geological clocks.

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