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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, what happens to a planet's speed as it orbits the sun?
It speeds up when closer to the sun and slows down when further away.
It remains constant throughout the orbit.
It speeds up as it moves away from the sun.
It slows down when closer to the sun and speeds up when further away.
Which of the following defines Kepler's Third Law?
The square of the orbital period is directly proportional to the cube of the semi-major axis of its orbit.
All planets have circular orbits around the Sun.
The paths of the planets are determined by gravitational forces only.
The speed of a planet is constant throughout its orbit.
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