The period of Comet Halley is approximately 75 years. Assume its perigee is at 0.5 AU from the Sun (1 AU or "astronomical unit" is the mean Earth-Sun distance). How many AU is is it from the Sun to its apogee? Does it get further from the Sun than the mean distance of Pluto, about 39 AU?

Question

jamesj · Answer

Do you know Kepler's laws?  They will help you here.

anonymous · Answer

I've read the laws but I'm not sure which law I should apply to this question