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astronomy test 2
chapter 6
35
Astronomy
Undergraduate 2
10/17/2011

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Term
T or F
All Planets have moons.
Definition
F
Term
The inner planets tend to have..
Definition
fewer moons
Term
the planets that have rings also tend to have
Definition
many moons
Term
in the leading theory of solar system formation, the planets..
Definition
formed from the same flattened, swirling gas cloud that formed the Sun
Term
the solar system is differentiated because..
Definition
only rocky and metallic particles could form close to the Sun
Term
the asteroids are mostly
Definition
found between Mars and Jupiter
Term
planetary orbits
Definition
are almost circular, with low eccentricities
Term
which of the characteristics below describes the terrestrial planets?
Definition
possessing weak magnetic fields
Term
the smallest sort of interplanetary matter is called
Definition
interplanetary dust
Term
the tail of a comet always point
Definition
away from the Sun and becomes longest and brightest at perihelion
Term
the Grand Tour of all four jovians was conducted by
Definition
Voyager 2
Term
as the solar nebula contracts due to gravitation, the cloud
Definition
spins faster
Term
which of the following was the first planet discovered with the aid of a telescope?
Definition
Uranus
Term
which of the following terrestrial planets has oxygen in its atmosphere?
Definition
only Earth
Term
on which of the following planets have scientists landed a space probe?
Definition
both Venus and Mars
Term
according to the nebula theory, which of the following statement is true?
Definition
the formation of planets is a natural by-product of star formation
Term
where in the solar system does the asteroid belt lie?
Definition
between the orbits of Mars and Jupiter
Term
of the planets in the solar system, which one's orbit has the largest tilt with respect to the ecliptic plane?
Definition
Mercury at 7 degrees
Term
which of the major planets listed below has the highest mass?
Definition
Saturn
Term
which of the following is the only spacecraft to have visited four planets in the solar system so far?
Definition
Voyager 2
Term
how many major planets are there in the solar system?
Definition
8
Term
if Mercury is the first planet and Neptune the 8th, which planet is the sixth?
Definition
Saturn
Term
which of the following is not a jovian planet?
Definition
Pluto
Term
which of the following objects are composed of material mostly unchanged since the formation of the solar system?
Definition
comets and asteroids
Term
what is the composition of comets?
Definition
Icy with dust
Term
what is the significance of the star Beta Pictoris with regard to solar system formation?
Definition
it was discovered to have a disk similar to the solar nebula surrounding it
Term
which planet is approximately halfway between Pluto's orbit and the Sun?
Definition
Uranus, the seventh planet from the Sun
Term
the dwarf planet Eris was discovered in 2005, orbiting the Sun at an average distance about twice that of Pluto. In which of the following ways do Pluto and Eris differ from the terrestrial and jovian planets in our solar system?
Definition
Both Pluto and Eris are smaller than any of the terrestrial planets.
Both Pluto and Eris travel in more elliptical orbits than any of the terrestrial or jovian planets.
Both are less massive than any of the terrestrial or jovian planets
Term
Farthest to Closet planets
Definition
Pluto, Saturn, Jupiter, Mars, Earth, Mercury
Term
Highest to Lowest mass
Definition
Sun, Jupiter, Earth, Mars, Mercury, Pluto
Term
Largest to Smallest in radius
Definition
Sun, Jupiter, Earth, Mars, Mercury, Pluto
Term
Terrestrial Planets
Definition
solid, rocky surface, small size, located within the inner solar system
Term
Jovian Planets
Definition
extensive ring systems, numerous orbiting moons, primarily composed of hydrogen, helium, and hydrogen compounds, low average density
Term
assuming that other planetary systems form in the same way as our solar system formed, where would you expect to find terrestrial planets?
Definition
terrestrial planets will likely be located nearer the planetary system's star than any jovian planets
Term
compared to terrestrial planets, jovian planets are...
Definition
more massive and lower in average density
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