Kepler's Laws

When a planet orbits the Sun, one of the foci of the elliptical orbit is 

• the axis
• the perihelion
• the center
• the Sun

The place where a planet is closest to the Sun as it orbits the Sun is called the

• perihelion
• aphelion

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

An ellipse is drawn around two points called

• aphelion
• perihelion
• foci
• axis

The place where a planet is farthest away from the Sun in its orbit around the Sun is called the

• aphelion
• perihelion

A planet moves __________ when it is farthest from the sun.

• faster
• slower

Kepler's first law states that the orbits of the planets are oval in shape or 

• ellipses
• perfect circles

If a planet is closer to the sun, its orbit will be _____ than one farther away. 

• longer
• slower
• bigger
• shorter

 The planet travels faster when it is closer to the sun and slower when it is farther away when it is closer to the sun and slower when it is farther away describes which of Kepler's Laws (see illustration)

• 1st
• 2nd
• 3rd
• None of the above

According to Kepler’s 3rd Law of Planetary Motion the farther a planet is located from the Sun...

• the shorter its period of revolution
• the longer its period of revolution