Suppose that the mirror described in Part A is initially at rest a distance R away from the sun. What is the critical value of area density for the mirror at which the radiation pressure exactly cancels out the gravitational attraction from the sun?

Express your answer numerically, to two significant figures, in units of kilograms per meter squared.

Express your answer numerically, to two significant figures, in units of kilograms per meter squared.

## This question was asked on Dec 04, 2010.

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