Orbits, Density, and Planets

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.

The larger the star, the __________________ the habitable zone.

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

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.

Within its orbit, as the planet gets closer to its host star:

• the planet speeds up.
• the force of gravity on the planet increases.
• the temperature of the planet increases.
• all of the above.

How do the orbits of the outer planets compare to the inner planets?

• The outer planets have shorter orbits because their rotations are shorter.

• The inner planets have shorter orbits because their rotations are shorter.

• The outer planets have longer orbits because they are farther from the sun.

• The inner planets have longer orbits because their orbits are ellipses.

Which are the terrestrial or rocky planets?

• Venus, Earth, Mercury, Mars

• Mercury, Venus, Earth, Jupiter

• Mercury, Venus, Mars, Saturn

• Venus, Mars, Earth, Saturn

Planets that are closest to the Sun are identified as

• low-density jovian planets

• low-density terrestrial planets

• high-density jovian planets

• high-density terrestrial planets

A student knows the mass of an object. What other variable does the student need to know to calculate the object's density?

• Color
• Weight
• Volume
• Length

I have two objects with the same volume but different masses.  Which object will be more dense?

• The object with less weight.
• The object with more weight.
• The object with more mass.
• The object with less mass.