2/ when we say that the eight official IAU planets have orderlymotions, what do we mean?

A/ we mean that they all orbit the Sun in the same big circle,all in a line, one after the other, all revolvingcounterclockwise

B/ we mean that they orbit the Sun in nearly circular orbits,all going clockwise, all in the same plane

C/ we mean that they orbit the Sun in nearly circular orbits,all going counterclockwise, all in the same plane

D/ we mean that they orbit the Sun in a sphere, all goingcounterclockwise

5/ where in the solar nebula did rentals condense, in alllikelihood?

A/ only outside the frost line

B/ only inside the frost line

C/ it never got cold enough in the solar nebular for metals tocondense

D/ everywhere throughout the solar nebula, except very close tothe Sun

6/ what, in all likelihood, is the primary reason for theseparation of planetary properties (roc/metal-rich vs gas-rich)with distance from the Sun in our Solar System?

A/ scientists can’t explain this observation

B/ the location of the frost line in the Solar Nebula and thetypes of materials which were able to condense within or outsidethat line

C/ the location of the bombardment line in the solar nebula andwhere a planetesimal was located relative to that line

D/ how quickly the solar wind was able to reach the planet toturn off hydrogen and helium gas accretion

7/ Imagine that instead of being between the orbits of Mars andJupiter, the frost line had instead been located at about Earth’sorbit. What impact might that have had on the number of terrestrialplanets in our solar system?

A/ the location of the frost line had nothing to do with theformation of the planet

B/ the number of terrestrial planets would probably have gonedown.

C/ there would probably have been no impact

D/ the number of terrestrial would have gone up

8/ why do scientists think did the Jovian planets stopgrowing?

A/ once a Jovian planet reaches Jupiter’s size, feedbackmechanisms in its accretion disk prevent further growth

B/ the solar wind blew the remaining gas away, preventingfurther growth by accretion gas

C/ they naturally stopped growing once they had accreted all ofthe gas in the solar nebula

D/ all of the hydrogen compounds and rock/metal condensatesbeyond the frost line destroyed themselves in collisions, so theycould not collide with Jovian planet planetesimals and make themgrow

9/ imagine that the solar wind had turned on later in theformation of the solar system than it did. What impact might thathave had on the growth of the planets?

A/ planetary formation would have been extended, and planetswould have ended up being bigger than they are

B/ planetary formation would have been interrupted and planetswould have ended up being smaller than they are

C/ there would have been no impact

13/ 4 planets orbit 4 identical stars. All 4 planets orbit theirparent stars at identical average distances. The planets are allterrestrial-type planets, and range in size from small to verylarge. Which planet would you expect to be the most geologicallyactive?

A/ the rockiest planet

B/ the biggest planet

C/ a planet which is smaller than the biggest planet, but largerthan the smallest planet

D/ the smallest planet

14/ Consider what would have happened to a large (~10 times themass of the Earth) planetesimal if it had formed beyond the orbitof Neptune. If that planetesimal had gone on to form a planet, howwould you expect that planet’s mass to compare to the mass ofSaturn

A/ larger mass than Saturn

B/ similar to our Sun

C/ smaller mass than Saturn

D/ same as Saturn

15/ which Jovian planet has the biggest internal pressure?

A/ Jupiter

B/ Neptune

C/ Uranus

D/ Saturn

16/ which Jovian planets, if any, have cores which aredifferentiated into a layer of hydrogen compounds and a layer ofrock and metal?

A/ Jupiter

B/ Saturn

C/ Uranus

D/ neptune

E/ all of the above

F/ only Jupiter and Saturn

G/ only Uranus and Neptune

H/ none

17/ why is Io more volcanically active than our moon?

A/ Io is still warm from its formation process

B/ Io is much larger than our moon

C/ Io has a different internal heat source

D/ Io has a higher concentration of radioactive elements