Astronomy HW 4

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  1. In what ways do the terrestrial and jovian planets differ?
    • 1. The terrestrial worlds have few or no moons while the jovian have many.
    • 2. The orbits of the terrestrial worlds are relatively close together, while the jovian ones are far apart.
    • 3. The terrestrial worlds are small and dense while the jovian ones are gaseous.
    • 4. The terrestrial planets that do have atmospheres have ones made of heavier compounds in general than those of the jovian ones.
  2. What three planets have retrograde rotations about their axes? (with Pluto being a planet)
    Venus, Uranus, and Pluto
  3. How long does it take for light from the sun to reach the orbit of Pluto, 40 astronomical units away?
    5.6 hours
  4. What is a characteristic of a terrestrial planet?
    Lower density than that of jovian planets.
  5. Where in the solar system does the asteroid belt lie?
    Between the orbits of Mars and Jupiter
  6. Which of the orbits of the solar system planets have the largest tilts with respect to the ecliptic plane?
    Mercury and Pluto (7 degrees and 17 degrees)
  7. Which of the planets has the highest mass?
  8. What is the only spacecraft to have visited four planets in the solar system so far?
    Voyager 2
  9. What fraction of the total mass of the solar system is contained in the Sun itself?
    99.9 percent
  10. Which of these planets has the lowest mass: Earth, Mars, Mercury, Venus, or Neptune?
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Astronomy HW 4
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