Kepler's Laws, Ellipses, and Eccentricity


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The planets in our solar system all have ___orbits:

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1. A planet's average distance from the sun is equal to the:

2. If a planet has an orbital eccentricity equal to 0.70, then its orbit is:

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About This Quiz & Worksheet

Kepler's First Law of Planetary Motion tell us the shape of Earth's orbit around the Sun. This lesson covers Kepler's law including defining an ellipse.

Quiz & Worksheet Goals

This assessment will test your knowledge of Kepler's First Law of Planetary Motion including:

  • The shape of the orbits of all planets in our Solar system
  • The term that is equal to a planet's average distance from the sun
  • The term that defines one of two fixed points from which an ellipse can be generated
  • The term that means the extent to which an orbit deviates from a circle

Skills Practiced

  • Interpreting information - verify that you can read information regarding Kepler's First Law of Planetary Motion and interpret it correctly
  • Defining key concepts - ensure that you can accurately define main phrases, such as an orbit
  • Making connections - use understanding of the concept of eccentricity and how it applies to planetary orbits

Additional Learning

To learn more about Kepler's First Law of Planetary Motion, review the attached lesson Kepler's Laws, Ellipses & Eccentricity. This lesson covers the following objectives:

  • Define Kepler's First Law of Planetary Motion
  • Understand what an ellipse is and how an ellipse is formed
  • Define foci and know how the sun is positioned in the Earth's orbit
  • Differentiate between Major Axis and Semimajor Axis
  • Understand what eccentricity is and know the formula that defines the eccentricity of a planet's orbit