The Sun Is Gradually Increasing in Luminosity as It Ages

question 43

Multiple Choice

The Sun is gradually increasing in luminosity as it ages. It is 20% more luminous than it was when it was born. Why isn't this considered to be an explanation for global warming?

• A) The Sun is increasing in luminosity much too slowly, over many millions of years.
• B) The scientists are covering up this potentially valid explanation.
• C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does.
• D) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today.

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