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**1. Homework Statement**

I need to find first of all the period of Halley's comet given that:

eccentricity: 0.967

perihelion: 8.8x10^7 km

and AU = 1.496x10^8km

**2. Homework Equations**

Kepler's laws

**3. The Attempt at a Solution**

I think that the

Perihelion = a(1-e) where a is the semi major axis. So I solved for a and then used t^2 = a^3 for period