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Kepler's Third Law of Planetary Motion

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Questions and Answers

According to Kepler's first law, which shape describes the orbit of a planet?

Circle

Ellipse (correct)

Square

Triangle

Why are the foci of an ellipse important in planetary orbits?

They indicate where the planet is located

They help determine the eccentricity of the orbit (correct)

They are just a point of reference

They show the major and minor axes of the ellipse

What type of axis does an ellipse have?

Long and short axes (correct)

Horizontal and vertical axes

Diagonal axes

Prime and secondary axes

In terms of shape, what distinguishes elliptical orbits from circular orbits?

Eccentricity Signup and view all the answers

Which astronomer developed three laws to describe planetary motion?

Johannes Kepler Signup and view all the answers

How does the sun's position differ in an elliptical orbit compared to a circular orbit?

The sun is at one focus in an elliptical orbit Signup and view all the answers

What term describes the oval shape of most modern-day planetary orbits?

Ellipse Signup and view all the answers

Which factor determines how elongated or circular an orbit appears?

"Eccentricity" Signup and view all the answers

"Oort cloud" is related to which concept described in the text?

"Orbital eccentricity" Signup and view all the answers

The long axis of an ellipse corresponds to which astronomical element?

The major axis Signup and view all the answers