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TFM

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## Homework Statement

Estimate the surface temperature of Mercury (the planet). Mercury is distant 0.38 ORE from the Sun, where the Earth-Sun distance, ORE is 1.49.108m. The radii of the Sun, Earth and Mercury are 696.103, 6.38.103 and 2.42.103 km respectively.

## Homework Equations

Heat (IR Radiation) follows inverse square Law

## The Attempt at a Solution

See I am confused with why the Sun Earth and Mercury's radius are on here. I know that Infra Red radiation follows the inverse square law, so I would ave thought you would have used this to find the temperature on Mars, however, the radius are given, so I am slightly confused...is there more to this question?

Thanks in Advance,

TFM

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