1. The Apollo Asteroids _______, and the Trojan Asteroids _______.
a) cross the orbit of Mars; are located 60 degrees from Jupiter
b) cross the orbit of Earth; are located 60 degrees from Jupiter
c) cross the orbit of Mars; are located 60 degrees from Earth
d) cross the orbit of Earth; are located 60 degrees from Mars
e) cross the orbit of Mars; are located 60 degrees from Venus
2. We see that the densities of the planets _______ as we move outward through the solar system, due to _______.
a) increase; condensation, which causes the dense material to stay away from the Sun.
b) decrease; condensation, which causes the dense material to stay near the Sun.
c) increase; differentiation, which causes the dense material to stay away from the Sun.
d) decrease; differentiation, which causes the dense material to stay near the Sun.
3. The dust tail of a comet is not as straight as the ion tail because _______.
a) the ions are more massive than the dust particles
b) the dust particles are more massive than the ions
c) the dust tail is influenced by Jupiter
d) the dust tail is influenced by the Moon
4. The Kirkwood gaps in the asteroid belt are due to _______.
a) orbital resonances with Neptune
b) orbital resonances with Jupiter
c) orbital resonances with Pluto
d) orbital resonances with Saturn
e) orbital resonances with Uranus
5. Most short period comets are located in the _______ right now.
a) Kuiper belt
b) Oort cloud
c) Asteroid belt
d) inside the orbit of Mercury
e) inside the orbit of Venus
6. Most long period comets are located in the _______ right now.
a) Kuiper belt
b) Oort cloud
c) Asteroid belt
d) inside the orbit of Mercury
e) inside the orbit of Venus
7. The Condensation Theory for planetary formation adds _______ to the Nebular Theory.
a) helium gas
b) carbon dioxide
c) ice
d) dust
e) lithium gas
8. Protoplanetary nebula observed in our galaxy radiate strongly in the _______ region of the electromagnetic spectrum.
a) optical
b) gamma-ray
c) radio
d) infrared
e) X-ray
9. The majority of meteorites found on Earth have a composition that is mostly _______.
a) silicate or iron
b) carbon
c) oxygen
d) hydrogen
e) helium
10. The Widmanstatten patterns in iron meteorites reveal that the meteorites were _______.
a) frozen solid
b) cooled slowly over millions of years
c) cooled quickly in a few thousand years
d) mostly hydrogen
e) mostly helium