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We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.

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.

Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.

Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.

By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.

We can get absolute ages only if we have rocks from that surface.

For others, all we are doing is getting a relative age, using things like the formation of craters and other features on a surface.

Based on our study of meteorites and rocks from the Moon, as well as modeling the formation of planets, it is believed (pretty much well-established) that all of the objects in the Solar System formed very quickly about 4.56 billion years ago.

When we age date a planet, we are actually just dating the age of the surface, not the whole planet.

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