which of these planets was discovered purely by accident within the last thousand years?
A Saturn
B Uranus
C Neptune
D Pluto
compared to Earth, the expected seasonal changes on Uranus because of its orbital and spin-axis alignments will be
A much less
B very much exaggerated
C absent, because of the alignment of the spin axis
D the same
the rings of Uranus were discovered
A by close-up inspection made by the voyager 1 spacecraft
B during the time of an "occultation" of a star by Uranus
C by Galileo's contemporary Simon Marius
D by complex calculations made by john couch Adams and urban leverrier
the major planet whose spin axis lies almost in its orbital plane is
A Mars
B Neptune
C Mercury
D Uranus
which planet was discovered by accident, by means of a telescope?
A Neptune
B Saturn
C Pluto
D Uranus
Uranus' magnetic field
A is not known to exist
B is in the planet's equatorial plane
C is in the planet's polar plane
D tipped 60with respect to the rotation axis
the voyager 2 mission to Uranus showed that, compared to the Earth's magnetic field, the magnetic field of Uranus
A is much weaker.
B would not generate auroras in the atmosphere.
C has a much larger tilt with respect to the spin axis.
D cannot arise from a liquid, conducting core.
E is not a dipole.
the peculiar rotation of Uranus is probably due to:
A the way it was originally formed.
B a slowly changing axis of rotation due to interactions with Jupiter and Saturn.
C a slowly changing axis of rotation due to interactions with its moons.
D a catastrophic event such as a collision with another large body.
Uranus is peculiar because its
A orbit is highly eccentric
B orbit is strongly inclined to the ecliptic plane
C satellites are in polar, rather than equatorial, orbits
D axis of rotation is in the ecliptic plane
from the results of the voyager 2 mission of Uranus, we now know that the
A planet has fewer rings than expected.
B magnetic field has a large tilt to the spin axis.
C larger moons have smooth surfaces and little evolution.
D rings are made of objects hundreds of meters in radius.
which two Jovian planets are most similar in sizes, masses, composition, and structure?
A Jupiter and Saturn.
B Saturn and Uranus.
C Neptune and Jupiter.
D Jupiter and Uranus.
E Neptune and Uranus.
Uranus is unique in that
A it has the least average density of the planets.
B its poles point nearly toward the sun at some times.
C it is the most distant of the Jovian planets.
D its north pole is south of its orbital plane; it has a backwards rotation from any other planet.
E it has a more eccentric orbit than any other planet.
the surprising fact about the magnetic field of Uranus compared to that of the Earth or Jupiter is
A that it is much more intense than that of any other planet
B that its axis is precisely aligned with the spin axis of the planet
C that its axis lies at a larger angle (55 ) to the planet's spin axis than in other planets
D that it is extremely small or absent
the spacecraft which successfully photographed Uranus on the 1986 fly-by mission was
A voyager
B venera
C Viking
D pioneer
the blue-green appearance of Uranus is caused by
A scattering of light from the dust in the thick atmosphere
B the color of the surface of the planet
C the reflection of blue light by the ice crystals on the planet's surface a in its atmosphere
D the atmosphere of methane gas, which preferentially absorbs the red parts of the solar
spectrum
Uranus and Neptune do not contain liquid metallic hydrogen because they
A are not massive enough.
B are not rich enough in hydrogen.
C rotate too slowly.
D are too far from the sun.
Uranus and Neptune do not contain liquid metallic hydrogen because they
A are not massive enough
B are not rich enough in hydrogen
C they rotate too slowly
D they are too far from the sun
Uranus and Neptune have similar
A masses.
B sizes.
C densities.
D atmospheres.
E all of the above.
since Uranus has a higher average density than Saturn
A it must rotate faster
B it must have much more rocky material
C it must have a stronger magnetic field
D it must have a higher concentration of icy materials
which planet has narrow, sharply defined rings?
A Jupiter
B Saturn
C Uranus
D Neptune
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