Orbits and Eccentricity

A perfect circle has an eccentricity of ______.

• 0

• 1

• 0.5

• 0.75

Calculate the eccentricity for the following orbit.

• 0.2

• 0.4

• 0.6

• 0.8

Which orbit is most eccentric?

• 1

• 3

• 4

• 5

When a planet orbits the Sun, one of the foci of the elliptical orbit is 

• the Moon

• the Earth

• the Sun

• a distant star

If an orbit has an eccentricity of 0.5, what is its shape?

• circular

• elliptical

• hyperbolic

• parabolic

What is eccentricity?

• a measurement of how elliptical an orbit is.

• a measure of the speed of an object in space.

• the distance between two foci of an ellipse.

• the angle of inclination of an orbit.

An ellipse is drawn around two points called

• vertices

• centers

• foci

• axes

During which month is the earth moving the slowest?

• July

• March

• January

• September

What is the maximum eccentricity an ellipse can be?

• 0.5

• 1

• 0.8

• 0.9

The flattest ellipse before it becomes a line will have an eccentricity of _______.

• 0.75

• 0.85

• 0.99

• 0.95