What important change in the Sun over the past four billion years is thought to be very important to understanding the climates of Venus,Earth,and Mars?

Question

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The gradual brightening of the Sun over the past four billion years is thought to be very important to understanding the climates of Venus, Earth, and Mars. This is because as the Sun gets brighter, more solar radiation reaches the planets, which can cause changes in their climates. For example, on Earth, this increase in solar radiation may have led to the melting of glaciers and the evolution of complex life forms.

What Important Change in the Sun Over the Past Four