Kepler’s First Law states that all planetary orbits are circular.

Kepler’s Second Law implies that a planet moves faster when it is closer to the Sun.

Kepler’s Laws can only be applied to planets in our solar system.

According to Kepler’s Third Law, the square of the orbital period is directly proportional to the cube of the semi-major axis of the orbit.

Which of the following best describes Kepler's First Law?

• Planets move in circular orbits
• Planets sweep out equal areas in equal time intervals
• Planets move in elliptical orbits with the Sun at one focus
• The force of gravity depends on mass and distance

What does Kepler's Second Law imply about a planet's speed when it is farther from the Sun?

• It moves faster
• It moves slower
• It stops moving
• Its speed does not change

Which of the following is correct for a planet with a larger orbit according to Kepler’s Third Law?

• It has the same period as all other planets
• It has a shorter period
• It has a longer period
• Its period is unrelated to orbit size

If a planet sweeps out an area of 1 million km² in 30 days, how much area will it sweep out in the next 30 days (assuming Kepler’s 2nd Law)?

• 0.5 million km²
• 1 million km²
• 2 million km²
• Depends on the position

Which of the following best represents Kepler's Third Law (for planets around the Sun)?