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## Homework Statement

How far would be a planet from the earth, when its period would be 2 years?

T = 2 years/730 days

a = 150*10

^{6}km

## Homework Equations

a

^{3}/T

^{2}= C

(C is the Kepler-Constant)

## The Attempt at a Solution

I tried inserting T in days and years, but I always get a wrong solution, since C (The distance from earth) does need to increse if it needs longer for its period. Any idea why?