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 or iron
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