Q&A Hero

Science

Q: Describe the odd rotations of Pluto and Charon.
Q: What would happen to a large moon inside the Roche Limit?
Q: The volcanic activity of Enceladus has what effect outside the moon itself?
Q: Define the Roche Limit.
Q: Define shepherd moons and give an example of them at work.
Q: What is the relationship between Mimas and Saturn's rings?
Q: What do all four ring systems have in common?
Q: How were the rings of Uranus discovered?
Q: Which four moons are believed to have large bodies of liquid water?
Q: What makes the surface of Mimas so striking?
Q: Which moon of Saturn has the surface with the widest range of ages? Why?
Q: The lakes on Titan have not been observed to have any waves. What does this suggest?
Q: In what way could the Huygens probe be considered a first?
Q: Describe the Cassini mission to Saturn in 2004-5.
Q: What is the future of Triton?
Q: What is the likely origin of Triton? Why do we believe this?
Q: What is the smallest of the Galilean moons? Why is it then the brightest?
Q: In what two ways is the orbit of Triton unusual?
Q: Contrast the volcanism of Io and Triton.
Q: How are the large amounts of heating at Io generated?
Q: Most astronomers now regard Pluto as the largest ________, and not a planet.
Q: Discovered in the 1990s, the ________ is a vaster, darker version of the more famed asteroid belt between Mars and Jupiter.
Q: It takes the Pluto-Charon system ________ to rotate around its common center of mass.
Q: It is likely that both Pluto and Triton were originally ________.
Q: Pluto was discovered in 1930 by ________.
Q: Pluto was named after the Roman god of the dark underworld, and also for ________.
Q: The F Ring around Saturn is maintained by ________.
Q: The dusty ring around Jupiter was discovered in 1979 by ________.
Q: The planet with the least obvious ring system is ________.
Q: The striking gap between Saturn's A and B rings is called the ________.
Q: All four rings systems lie within their planet's ________.
Q: All four ring systems lie around their planet's ________.
Q: The moon ________ may have erupted to create the E rings around Saturn.
Q: One hemisphere of Enceladus may have the youngest surface of any of the jovian moons, with volcanoes spewing "ash" and "lava flows" of ________.
Q: The cantaloupe skin terrain of Triton is thought to be due to ________.
Q: The next moon likely to be broken up into a ring is ________.
Q: The Saturnian moon of most interest to exobiologists is ________.
Q: The only Jovian moon to orbit its planet retrograde and out of the equatorial plane is ________.
Q: On Neptune's moon ________, geysers of liquid nitrogen rise 10 km high.
Q: The lakes of Titan consist of liquid ________.
Q: The orbit of Triton is ________, very different from all other major moons.
Q: The atmospheres of both Titan and Triton are mainly ________.
Q: The atmosphere of Titan is chiefly ________.
Q: The tidal stresses that create Io's volcanism come from Jupiter and ________.
Q: Compared to the size of Mercury, Ganymede is ________.
Q: A moon whose surface is smooth, with no craters, is probably ________.
Q: Europa is covered with an ocean of ________.
Q: The element erupting from the volcanoes of Io is ________.
Q: The Galilean moon of most interest to exobiologists is ________.
Q: As we go outward from Io to Ganymede, the density of the moons ________.
Q: To explain its magnetic field, Europa must have an ocean of ________.
Q: In general, the less cratered a moon's surface, the ________ it is.
Q: Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of ________.
Q: What is so unusual about Pluto's orbit? A) It lies exactly on the ecliptic. B) It has the lowest eccentricity of any planet's orbit. C) It is more inclined to the ecliptic than any of the eight planets. D) It has an unexpectedly short orbital period. E) Its orbital period is exactly twice that of Neptune's.
Q: Pluto is most similar to A) Europa. B) Miranda. C) Triton. D) our Moon. E) Mercury.
Q: Charon's orbit A) lies exactly in Pluto's orbital plane. B) is highly inclined to Pluto's orbital plane. C) is perpendicular to Pluto's equator. D) is retrograde. E) has not been determined yet.
Q: The two names most associated with the discovery of Pluto are A) Adams and Leverrier. B) Herschel and Bode. C) Kuiper and Whipple. D) Lowell and Tombaugh. E) Shoemaker and Levy.
Q: Pluto was discovered in A) ancient times. B) 1789. C) 1859. D) 1930. E) 1992.
Q: Pluto's density is most similar to A) the terrestrial planets. B) the jovian planets. C) the moons of the jovian planets. D) Mercury, but not Venus, Earth, or Mars. E) Saturn, but not Jupiter, Uranus, or Neptune.
Q: Which moon orbits a body only twice as big as it is? A) Triton B) our Moon C) Charon D) Miranda E) Mimas
Q: Which of the following rings of Saturn lies closest to the planet? A) the A ring B) the B ring C) the C ring D) the E ring E) the F ring
Q: Which was not a Voyager discovery about the rings of Saturn? A) They have dark spokes that defy gravity. B) They are made of tens of thousands of narrow ringlets. C) There are hundreds of smaller moons imbedded in them, creating the gaps. D) The F ring particles are herded by two shepherd moons. E) The E ring may have been made by volcanic eruptions from Enceladus.
Q: If Uranus takes 84 years to orbit the Sun, and Voyager 2 found its rings wide open at solstice in 1989, when will or did they next appear edge on, as seen from Earth? A) 1995 B) 2003 C) 2010 D) 2025 E) They can never appear edge on, due to Uranus' 98 degree axial tilt.
Q: If Saturn takes about 30 years to orbit the Sun, and its rings were seen edge-on in 1995, when did they next appear most open at solstice? A) 1998 B) 2002 C) 2005 D) 2007 E) 2010
Q: Describe the interaction between Jupiter and Comet Shoemaker-Levy 9.
Q: Contrast the Great Red and Great Dark Spots.
Q: Name two ways the magnetic fields of Uranus and Neptune defy the normal behavior of planetary magnetic fields.
Q: Discuss the roles that ammonia, hydrogen sulfide, and methane play in the appearances of the jovian planets.
Q: Contrast the compositions of Jupiter's belts and zones.
Q: How might the odd tilt of Uranus have been produced?
Q: Discuss the seasons of Uranus.
Q: Compare the differential rotation rates of the four jovian planets.
Q: Why was Voyager 2 an extremely efficient and productive probe?
Q: Compare and contrast the Galileo and Cassini missions.
Q: Why do Uranus and Neptune appear bluish?
Q: In what ways are the magnetic fields of Uranus and Neptune unusual?
Q: What common gas assumes an uncommon state in the mantles of Jupiter and Saturn? Why?
Q: What element is notably deficient in Saturn's atmosphere, and why?
Q: Uranus and Neptune are often called twin worlds. How do their axial tilts differ?
Q: Contrast the differential rotations of the four jovian planets. Explain.
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