– how can we determine the age of planets in the solar system?
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We believe all the planets formed together with the sun from a disc of dust and gas. That means they all have the same age as the sun.
From our models about stars we have a good idea what kind of light (colour spectrum, and how bright) a star of a certain age emits. Based on that we can calculate the age of the sun and all the planets to be roughly 4.6 billion years.
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