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Assessment
What is Kepler's first law of planetary motion?
Planets move in elliptical orbits with the Sun at one focus.
The speed of a planet increases as it gets closer to the Sun.
All planets have circular orbits around the Sun.
Planets do not change their distance from the Sun.
Which of the following states is true regarding Kepler's contribution to astronomy?
He introduced the idea of epicycles to explain planetary motion.
He formulated three laws of planetary motion based on meticulous observations.
He discovered the four largest moons of Jupiter.
He was the first to suggest that Earth orbits the Sun.
What did Kepler's second law of planetary motion state?
The squares of the periods of planets are proportional to the cubes of their semi-major axes.
A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
Planets move at constant speed in circular orbits.
Light from the Sun travels in straight lines to planets.
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