it was once thought that Pluto might be an escaped moon of Neptune because
A it has the same chemical composition as the other moons of Neptune
B early observers reported seeing more moons than are now present around Neptune
C its orbit is very eccentric, and doesn't fit the pattern of the other plan
D its satellite, Charon, has a period equal to Pluto's rotation period
it is unlikely that Pluto could have much of an atmosphere because
A it is so cold that most gases would have frozen out
B its gravity is so small that most gases would escape
C both of these
D neither of these
in what way(s) does Pluto resemble the Galilean moons of Jupiter?
A size
B density
C mass
D all of the above
E none of the above
the major planet in our solar system with the greatest orbital eccentricity (most elliptical orbit) is
A Pluto
B Mercury
C Mars
D Earth
Pluto is similar to
A the Jovian planets.
B the terrestrial planets.
C the satellites of Mars.
D none of the above.
the chief reason for not accepting the proposition that Pluto was once a satellite of Neptune is that
A it is impossible for a satellite to escape from a planet
B Pluto is much too large to have been a satellite of Neptune
C Pluto's composition is much too different from Neptune's for the two object to have been formed together
D Pluto itself has a satellite, which is true for no known satellite in the solar system
the best argument against the hypothesis of Pluto having been ejected from Neptune is
A the presence of Pluto's satellite
B the orbital properties of Neptune's current satellites
C conservation of angular momentum
D Kepler's third law
infrared observations indicate that a large fraction of the surface of Pluto is covered with
A rocks.
B iron.
C water ice.
D methane ice.
E carbon dioxide ice.
the chief reason for thinking that Pluto might once have been a satellite of Neptune is that
A Pluto and Neptune have approximately the same size
B Pluto's orbit is only twice as large as Neptune's orbit around the sun
C Pluto's orbit passes inside the orbit of Neptune
D Pluto and Neptune have the same density of matter and apparently the same composition
Pluto's moon is called
A umbriel
B nereid
C triton
D Charon
what is the moon of the planet Pluto called?
A callisto
B chiron
C Charon
D triton
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