A comet approaches the Sun to within 6.8 AU, and its orbital period is 70 years. Note: AU is the abbreviation for astro- nomical unit, where 1 AU = 1.50 x 10% km is the mean Earth-Sun distance. Thus, K's ~ 1 year? / AU3. A 6.8 AU UB Sun B UA Figure: Eliptical orbit of planet. How far from the Sun will the comet travel before it starts its return journey? Answer in units of AU