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Side A ------ Side B
Which solar system object has a kuiper belt? ------ Comet
Which of the following is the strongest evidence in support of the hypothesis that the solar system was formed by the collapse of a gas and dust nebula? ------ Images of stars with gas and dust disks surrounding them
Small planets do not have significant atmosphere because their _______ is weak. ------ Gravity
What conclusion can be drawn from the fact that some planets with solid surface and satellites have impact craters? ------ Planets and their satellites were showered by planetesimals
Which planet group has large orbital periods? ------ Jovian
Which of the following is true of the jovian planets? ------ All of these are correct
The 5th planet from the Sun is _______. ------ Jupiter
Compared to the ______ planets the ______ planets have ______. ------ Terrestrial; Jovian; many satellites
Which planet group contains rings? ------ Jovian
Which planet group has a faster spin? ------ Jovian 
Which of the following lists the planets in increasing order of distance from the Sun? ------ Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, P;uto
The 7th planet from the Sun is _____. ------ Uranus
Which solar system object is icy? ------ Comet
Astronomers estimate that the age of the solar system is about _______ years. ------ 4.6 billion
Which of the following is true of the terrestrial planets? ------ All of the choices are correct
According to the nebular hypothesis, which of the following sequences of events are chronologically correct? ------ Interstellar cloud, solar nebula, accretion, collisions between planetestimals, planets
Which solar system object has the most elliptical orbit? ------ Comet
Astronomers believe that the satellites of the Jovian planets were ______. ------ Planetestimals orbiting the growing planet
The Sun's mass is composed of ____ of elements other than Helium and Hydrogen. ------ 2%
Why was the recent discovery that planets more massive than Jupiter orbit near-by stars in small orbits surprising? ------ Because according to the nebular hypothesis, massive planets should only form away from their star
Which planet group contains silicates? ------ Terrestrial 
The Sun's mass is composed of _____ Helium. ------ 27%
Which of the following explains the rocky nature of the inner planets? ------ Only the rocky material could condense at the higher temperatures of the inner part of the solar nebula
Which solar system object has low density? ------ Comet
Which planet group has an abundance of hydrogen and helium? ------ Jovian
Which planet group has a large mass? ------ Jovian
The Sun's mass is composed of _____ Hydrogen. ------ 71%
Comets are ____ while asteroids are ____. ------ Icy; rocky
The 3rd planet from the Sun is ______. ------ Earth
The solar nebula is the disk of ____ from which the planets formed. ------ Gas and dust
The 6th planet from the Sun is _____. ------ Saturn
Which solar system object is 100km? ------ Asteroid
Which solar system object has on oort cloud? ------ Comet
The 1st planet from the Sun is _____. ------ Mercury
Which of the following statements is a critical issue resulting from such comparison? ------ Only very massive planets can form very near the star of extra-solar systems and the orbits of extra-solar planets can be very elliptical, suggesting that planets may migrate 
Which solar system object has an asteroid belt? ------ Asteroid
Which planet group contains craters? ------ Terrestrial
Which planet group contains many satellites? ------ Jovian
A successful theory of the solar system must be able to primarily explain: ------ The fact that the planetary orbits lie approximately in the same place
Which solar system object is 10km? ------ Comet
Which of the following objects is not a member of the solar system? ------ The constellation of Orion
Which of the following explains the fact that the Jovian planets have more hydrogen and helium than terrestrial planets? ------ The higher temperatures near the center of the solar nebula prevented the condensation of hydrogen and helium in the inner part of the disk
The discovery of extra-solar planetary systems supports the idea that over time, planets may migrate inward. ------ True
As seen from the north celestial pole, the planets orbit the Sun in a clockwise direction. ------ False
The fact that some satellites and planets have cratered surfaces supports the hypothesis that planets and satellites were bombarded by planetestimals. ------ True
The discovery of extra-solar planets confirm Bode's Law. ------ False

Side A ------ Side B
Which solar system object has a kuiper belt? ------ Comet
Which of the following is the strongest evidence in support of the hypothesis that the solar system was formed by the collapse of a gas and dust nebula? ------ Images of stars with gas and dust disks surrounding them
Small planets do not have significant atmosphere because their _______ is weak. ------ Gravity
What conclusion can be drawn from the fact that some planets with solid surface and satellites have impact craters? ------ Planets and their satellites were showered by planetesimals
Which planet group has large orbital periods? ------ Jovian
Which of the following is true of the jovian planets? ------ All of these are correct
The 5th planet from the Sun is _______. ------ Jupiter
Compared to the ______ planets the ______ planets have ______. ------ Terrestrial; Jovian; many satellites
Which planet group contains rings? ------ Jovian
Which planet group has a faster spin? ------ Jovian 
Which of the following lists the planets in increasing order of distance from the Sun? ------ Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, P;uto
The 7th planet from the Sun is _____. ------ Uranus
Which solar system object is icy? ------ Comet
Astronomers estimate that the age of the solar system is about _______ years. ------ 4.6 billion
Which of the following is true of the terrestrial planets? ------ All of the choices are correct
According to the nebular hypothesis, which of the following sequences of events are chronologically correct? ------ Interstellar cloud, solar nebula, accretion, collisions between planetestimals, planets
Which solar system object has the most elliptical orbit? ------ Comet
Astronomers believe that the satellites of the Jovian planets were ______. ------ Planetestimals orbiting the growing planet
The Sun's mass is composed of ____ of elements other than Helium and Hydrogen. ------ 2%
Why was the recent discovery that planets more massive than Jupiter orbit near-by stars in small orbits surprising? ------ Because according to the nebular hypothesis, massive planets should only form away from their star
Which planet group contains silicates? ------ Terrestrial 
The Sun's mass is composed of _____ Helium. ------ 27%
Which of the following explains the rocky nature of the inner planets? ------ Only the rocky material could condense at the higher temperatures of the inner part of the solar nebula
Which solar system object has low density? ------ Comet
Which planet group has an abundance of hydrogen and helium? ------ Jovian
Which planet group has a large mass? ------ Jovian
The Sun's mass is composed of _____ Hydrogen. ------ 71%
Comets are ____ while asteroids are ____. ------ Icy; rocky
The 3rd planet from the Sun is ______. ------ Earth
The solar nebula is the disk of ____ from which the planets formed. ------ Gas and dust
The 6th planet from the Sun is _____. ------ Saturn
Which solar system object is 100km? ------ Asteroid
Which solar system object has on oort cloud? ------ Comet
The 1st planet from the Sun is _____. ------ Mercury
Which of the following statements is a critical issue resulting from such comparison? ------ Only very massive planets can form very near the star of extra-solar systems and the orbits of extra-solar planets can be very elliptical, suggesting that planets may migrate 
Which solar system object has an asteroid belt? ------ Asteroid
Which planet group contains craters? ------ Terrestrial
Which planet group contains many satellites? ------ Jovian
A successful theory of the solar system must be able to primarily explain: ------ The fact that the planetary orbits lie approximately in the same place
Which solar system object is 10km? ------ Comet
Which of the following objects is not a member of the solar system? ------ The constellation of Orion
Which of the following explains the fact that the Jovian planets have more hydrogen and helium than terrestrial planets? ------ The higher temperatures near the center of the solar nebula prevented the condensation of hydrogen and helium in the inner part of the disk
The discovery of extra-solar planetary systems supports the idea that over time, planets may migrate inward. ------ True
As seen from the north celestial pole, the planets orbit the Sun in a clockwise direction. ------ False
The fact that some satellites and planets have cratered surfaces supports the hypothesis that planets and satellites were bombarded by planetestimals. ------ True
The discovery of extra-solar planets confirm Bode's Law. ------ False