planets and orbits

The closer a planet is to its host star: 

• the shorter the orbital period.
• the longer the semi-major axis.
• the colder the temperature.
• the more eccentric the orbit.

Which of the following would increase the force of gravity on a planet?

• Decreasing the mass of the star.
• Decreasing the distance between the planet and star.
• Decreasing the mass of the planet.
• All of the above.

Earth is traveling the fastest during the month(s) of:

• January.
• July.
• September through October.
• February through March.

Which planet has an orbital eccentricity most like the orbital eccentricity of the Moon?

• Earth
• Saturn
• Mars
• Mercury

The gravitational attraction between the star and the planet will be greatest at position 

• A
• B
• C
• D

An ellipse is drawn around two points called

• aphelion
• perihelion
• foci
• axis

Which planet is the largest?

• Jupiter
• Saturn
• Uranus
• Neptune

Which planet is seventh from the sun?

• Saturn
• Earth
• Venus
• Uranus

The spinning of an object on its axis is called______

• orbit
• rotation
• revolution
• tide

What are the reasons for the seasons?

• Earth's tilt and rotation.
• Earth's rotation and revolution.
• Earth's tilt and revolution.
• Earth's tilt and resolution