eccentricity

A perfect circle has an eccentricity of ______.

• 0
• .99
• 1
• 2

Which planet has an orbital eccentricity most like the orbital eccentricity of the Moon?

• Earth
• Saturn
• Mars
• Mercury

The gravitational attraction between the star and the planet will be greatest at position 

• A
• B
• C
• D

Which planet takes more time to complete one rotation on its axis than to complete one revolution around the Sun?

• Mercury
• Venus
• Mars
• Jupiter

Which diagram shows a planet with the least eccentric orbit?

• 1
• 2
• 3
• 4

What is the maximum eccentricity an ellipse can be?

• 0
• .5
• 1
• 42

Calculate the eccentricity for the following orbit. 

• 1.6
• 0.8
• 0.6
• 1.2

What is eccentricity? 

• a measurement of how elliptical an orbit is. 
• a measurement of the distance between the planet and the sun
• a measurement of how long the planet takes to rotate around the sun
• none of these

During what month is the earth moving the fastest around the sun? 

• July
• March
• January
• September

An ellipse is drawn around two points called

• aphelion
• perihelion
• foci
• axis