Question 1 (4 points)

Match each term to its definition.

Column A
1.	Orbital Period:	Orbital Period
2.	Astronomical Unit (AU):	Astronomical Unit (AU)
3.	Kepler's Third Law:	Kepler's Third Law
4.	Orbit:	Orbit

Column B

a.

A rule that shows how distance affects orbit time (P² = a³)

b.The average distance from Earth to the Sun (~93 million miles)

c.The path one object takes as it moves around another due to gravity

d.The time it takes a planet to orbit the Sun once

Question 2 (2 points)

Which of the following best describes the relationship between a planet's distance from the Sun and its orbital speed?

a	Planets farther from the Sun move faster in their orbits
b	Planets closer to the Sun move slower in their orbits
c	Planets closer to the Sun move faster in their orbits
d	Planets closer to the Sun move faster in their orbits

Question 3 (2 points)

Why do planets closer to the Sun have shorter orbital periods than those farther away?

a	They are smaller in size.
b	They experience stronger gravitational pull from the Sun.
c	They have more elliptical orbits.
d	They are warmer.

Question 4 (2 points)

If a comet has a very elongated orbit, what can be said about its speed as it nears the Sun?

a	It slows down.
b	It stops.
c	It moves at a constant speed.
d	It speeds up.

Use the formula P² = a³ to solve each problem. Round P to the nearest hundredth, and show your work.

Question 5 (5 points)

Use the following information to calculate the orbital period for the planet Venus. Be sure to show your work.

• a = 0.72 AU
• a³ = _____
• Plug your number into the formula P² = a³ and solve.
• P = _____ years

Your answer:

Question 6 (5 points)

Use the following information to calculate the orbital period for the planet Uranus. Be sure to show your work.

• a = 19.18 AU
• a³ = _____
• Plug your number into the formula P² = a³ and solve.
• P = _____ years

Your answer:

Question 7 (5 points)

Use the following information to calculate the orbital period for the planet Saturn. Be sure to show your work.

• a = 9.54 AU
• a³ = _____
• Plug your number into the formula P² = a³ and solve.
• P = _____ years

Your answer:

Question 8 (6 points)

In your own words, describe all three of Kepler's Laws of Planetary Motion.

Your answer: