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, Ks ~ 1 year2 / AUS A 6.8 AU Sun B 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