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1 1 of 5 4/21/2015 6:40 PM 1. Which of the following lists the outer planets in order of increasing mass?,,,,,,,,,,,, 2. The surface structure of 's largest satellite, Titan, is completely unknown because no spacecraft so far could take pictures through Titan's thick clouds. True, because no probe can pass through Titan's methane and ethane clouds. True, because Titan's atmosphere blocks all wavelengths of electromagnetic radiation. False. Recently in 2005, Cassini parachuted a probe into Titan's atmosphere and took the pictures of its surface. False, but all information related to Titan's surface comes from radar images taken by the Cassini spacecraft. 3. Of the outer planets, has the smallest diameter. Pluto 4. Which is the smallest of the outer planets?

2 2 of 5 4/21/2015 6:40 PM 5. Which is the largest planet? Earth 6. Which planet has the most extreme seasons? Venus 7. Which planet has the largest satellite in the Solar System? Mars 8. Although and have similar compositions their outer appearances are different because 's magnetic field is weaker than 's magnetic field. 's smaller size means it has a weaker gravitational field and thus less dramatic atmospheric effects. has more water molecules throughout its atmosphere giving it a uniform appearance. 's cooler temperatures allow for the formation of a hazy layer of ammonia clouds that surrounds the planet. 9. How does the mass of compare to the rest of the planets in the Solar System? 's mass is greater than all the other planet masses combined.

3 3 of 5 4/21/2015 6:40 PM and have comparable masses. 's mass is about equal to the sum of the terrestrial planet masses. 's mass is about equal to the sum of and 's masses. 10. Scientists believe a liquid water ocean might exist on the moon Titan. Europa. Mimas. Ganymede. 11. completes an orbit around the Sun every 84 years and spins once every 17 hours, approximately. Which of the following could be observed from the planet? Season cycle of 84 years near the poles. One sunrise every 17 hours on the equator. Days lasting several years near the pole tipped toward the Sun. Nights lasting several years near the pole tipped away from the Sun. All of the above. 12. What prompted astronomers to search for? was not following the precise orbit predicted by Newtonian physics. An explosive impact on from a colliding planetesimal caught the attention of astronomers. Bode's rule predicted a planet at the location of. Nothing prompted astronomers to look for, it was found by accident. 13. Which of the following accurately describes the properties of 's rings? The rings are a single, solid object. The rings are very wide but very thin and composed of large planetesimals a few kilometers in size. The rings are very wide but very thin and composed of small particles typically a few centimeters or meters in size. The rings are very wide but very thin veil of gas that surrounds the planet. 14. What chemical compound is responsible for and 's color? Complex organic compounds of sulfur and phosphorus. Ammonia. Methane. Water.

4 4 of 5 4/21/2015 6:40 PM 15. Why do astronomers believe that the Jovian planets must contain rocky material in their cores? Because silicates and irons were part of the overall composition of the solar nebula. Because the Jovian planets have large magnetic fields. Because the Jovian planets have large gravity. The statement of the question is incorrect. Astronomers believe that the Jovian planets consist exclusively of hydrogen and helium. 16. Of all the Jovian planets shows signs of tectonic plate motion. None of the above 17. The energy that stirs the circulation in 's atmosphere comes from. The Sun The planet's interior The tidal force of the Galilean moons The planet's magnetic field 18. is the largest of the Galilean moons. Callisto Europa Ganymede Io 19. The rings of consist primarily of. Small particles Boulder-size rocks Solid rings Hydrogen and helium

5 5 of 5 4/21/2015 6:40 PM 20. has the lowest density of all the planets in the solar system. Pluto

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