Planets and Orbits (review)

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.

A habitable planet could possibly contain:

• oxygen.
• flaming hot Cheetos.
• liquid water.
• ET's family.

A planet with a very eccentric orbit:

• is Venus.
• will most likely contain liquid water.
• has a much shorter year than Earth.
• will experience very extreme temperature changes.

Eccentricity is equal to:

• 'c' times 'a'
• 'a' divided by 'c'
• 'c' divided by 'a'
• mc²

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.

For all of the planets in our Solar system:

• a = 1 AU

• p = 3.14

• eccentricity = 0.02

• p^{2 =} a³

The larger the star, the __________________ the habitable zone.

• larger
• smaller
• closer to the star
• further away from the star

• 0.5
• 0.6
• 1.67
• 3.75

An exoplanet is:

• a planet that is about to supernova.
• any planet outside of our Solar System.
• too small to be a regular planet - like Pluto :(
• usually very similar to Earth.

In an ellipse:

• 'a' is always less than 'c'.
• the eccentricity is always more than 1.
• the two foci are always the same distance from the center.
• All of the above.