6. Given the following information on Jupiter's Galilean moons, (a) determine the average mass of Jupiter and (b) compare to the known value of 1.898 × 1027 kg. Jupiter's diameter is 1.40 × 105 km. Assume the diameter of Jupiter is 139,82O km. Period in Orbital Diameter in Name Days Jupiter Diameters lo 1.77 6.03 Europa 3.55 9.60 Ganymede 7.16 15.3 Callisto 16.7 26.9

14. Based on what the nebular theory tells us about the formation of our own solar system, what does the theory predict for the possibility of other planetary systems? Group of answer choices Other planetary systems should be identical to our own. Planetary systems should be very rare. Most stars should have one or two planets, but not more. Planetary systems should be common.   15. Which of the following statements best describes the accomplishments of these three people? Group of answer choices Tycho collected the data, Kepler provided the model in the form of laws, Newton explained the model in terms of gravity. Kepler collected the data, Tycho provided the model in the form of laws, Newton explained the model in terms of gravity. Tycho collected the data, Newton provided the model in the form of laws, Kepler explained the model in terms of gravity. Newton collected the data, Tycho provided the model in the form of laws, Kepler explained the model in terms of gravity.

6 Why isn't there a planet where the asteroid belt is located? A The temperature in this portion of the solar nebula was just right to prevent rock from sticking together. B C D There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. There was not enough material in this part of the solar nebula to form a planet. Gravitational tugs from Jupiter prevented material from collecting together to form a planet. E A planet once formed here, but it was broken apart by a catastrophic collision.

Which of the following is least reasonable regarding Trojan asteroids? Group of answer choices Trojan asteroids are located in either of two gravitationally stable regions within the orbit of Jupiter, about 120° apart.   Trojan asteroids are those asteroids in the asteroid belt which are hidden from view by Mars.   Trojan asteroids are kept in orbit primarily by the gravitational effects of Jupiter and the Sun.   Trojan asteroids pose much less danger to us than Earth-crossing asteroids.   Trojan asteroids constitute a small minority of all the known asteroids.