6. Which one of these is not true? a) planets orbit the Sun in the same directio
ID: 294353 • Letter: 6
Question
6. Which one of these is not true? a) planets orbit the Sun in the same direction that the Sun rotates b) Pluto is neither a terrestrial nor a jovian planet c) planets rotate at nearly the same speed d) planetary orbits lie in nearly the same plane c) planetary orbits are nearly circular 7. What is the basic difference between comets and asteroids? a) Comets always emit their own light, while asteroids only reflect sunlight. b) Comets always move in open orbits around the Sun, visiting the Sun only once in their lifetime, while asteroids move in closed orbits. c) Comets are mostly composed of ices, while asteroids are mainly composed of rocks. d) Comets are spherical, while asteroids are mostly irregular in shape. 8. More than any other, which physical parameter in the young solar system determined whether a planet became a terrestrial or jovian? a) mix of chemical constituents b) density of hydrogen gas in the nebula c) temperature distribution within the nebula d) overall rotation of the nebula 9. Put a check next to each answer that is true for terrestrial planets (as compared to jovian planets). Small size large mass low density or or or thin atmosphere or or large size small mass high density thick atmosphere rotate slowly rotate fast Extra Credit: 10. Examine the diagram of the Moon's orbit below. You are on Earth observing the Moon. a) You see the Moon at point A below. What is the name of that Moon phase? pm b) Can an eclipse happen at that phase? Why or why not? Sun's Noon o pm Ravs e) You see the Moon at point B below. What is the name of that Moon phase? Moon orbit d) What time will that phase be directly overhead according to the diagram? e) Can an eclipse happen at that phase? If so,isit a solar or a lunar eclipse?Explanation / Answer
6) option c is not true because all planets have different rotational speed which is reflected by the day length and it varies with each planet, for example marks has rotational speed of 868 km/hr while mercury has rotationl speed of 11km/hr.
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