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Assessment
What is the shape of the orbits of planets according to Kepler's First Law?
Ellipses
Circles
Parabolas
Hyperbolas
According to Kepler's Second Law, how do planets move in their orbits?
At a constant speed
At varying speeds depending on their distance from the Sun
In a straight line
In circular paths only
What constant did Kepler derive from his observations that is essential in determining a planet's orbital period?
The gravitational constant
The speed of light
The ratio of the cube of the semi-major axis to the square of the orbital period
The mass of the planet
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