High Definition Image of Earth By dating the rocks in Earth's ever-changing crust, as well as the By studying other bodies in the solar system, scientists are able to find out more about the early history of the planet. On Earth, we have a very powerful method of relative age dating: at boundary stratotypes define the limits of the main formalized units, such as "Permian". On almost all the other solid-surfaced planets in the solar system. Absolute age dating determines the "calendar" time at which a rock, surface, impact velocities of the colliding bodies by means of either empirical crater scaling laws or Fortunately, Earth provides one such check for the inner solar system.
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An interesting feature of these ancient rocks is that they are not from any sort of "primordial crust" but are lava flows and sediments deposited in shallow water, an indication that Earth history began well before these rocks were deposited. The ages measured for Earth's oldest rocks and oldest crystals show that the Earth is at least 4. The best age for the Earth 4.
The Moon is a more primitive planet than Earth because it has not been disturbed by plate tectonics; thus, some of its more ancient rocks are more plentiful. Only a small number of rocks were returned to Earth by the six Apollo and three Luna missions. Thousands of meteorites, which are fragments of asteroids that dating on earth solar definition to Earth, have been recovered.
These primitive objects provide the best ages for the time of formation of the Solar System. There are more than 70 meteorites, of different types, whose ages have been measured using radiometric dating techniques.