Relative dating planets

The question comes from Coffee who asked me to weigh in on some discussion he had read about some of the astronomy in the movie "Prometheus." Among the points raised was: "Can you really tell where a unique star system is based on five dots in a cave painting?

One technique, potassium-argon dating, determines the age of a rock sample by measuring how much argon gas it contains.As time went by, the dust grains snowballed into larger and larger rocks and boulders.About 4.5 billion years ago, the process of planet formation was more or less complete, as the fledgling planets mopped up any remaining smaller competitors.The terrestrial planets we see today are the survivors of a prolonged, chaotic period of colossal impacts which left their surface imprints in the form of giant basins and craters How can we piece together a planet's history since its formation?On Earth, the geological timeline is quite easy to determine, since we can analyse the rocks and minerals in laboratories.

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