The brightest planet in our sky is Venus, which is sometimes as bright as apparent magnitude -4 when it is at a distance of about 1 AU. How many times fainter would it look from a distance of 1 par sec? What would its apparent magnitude be? (Note: 1 pc = 2.1 = 105 AU. Hints: Remember the inverse square law from Chapter 9; also, review the definition of magnitudes in Chapter 2.)
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