1. Planets and Orbits

2.  Objective: to be able to calculate
eccentricity of orbits

3. Order of planets
 My Very Excellent Mother Just Served Us
Noodles
 Mercury, Venus, Earth, Mars,(Asteroids)
Jupiter, Saturn, Uranus, Neptune

4. Gravity
 Planets orbit around the sun due to
gravity
 Gravity weakens with increased distance
 (think magnetism)

5. Ellipse
 The shape of orbits.

7. Terms to know
 FOCI
 MAJOR AXIS
 MINOR AXIS

9. Eccentricity
 Eccentricity: shape of an ellipse.
 0 = circle
 1 = straight line
 (bigger the #, more squashed the ellipse)

11.  Eccentricity = distance b/t foci/length of
major axis
 E = D/L

12. E=D/L


13. E= D/L
 Distance between foci = 152 – 147 = 5
(million) km
 Length of major axis = 147 + 152 (million)
km = 299 million km
 E = D/L = 5/299 = .017

14. Problem #1

15. Problem 2
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