1. Finally, only a few planets were … 2. Within the frost line, temperatures were too high for hydrogen ices to form. This fact tells us __________.Suppose we want to know what the Sun is made of. How do these meteorites support our theory about how the terrestrial planets formed?The meteorites' appearance and composition is just what we'd expect if metal and rock condensed and accreted as our theory suggests.According to our present theory of solar system formation, which of the following statements about the growth of terrestrial and jovian planets is not true?The jovian planets began from planetesimals made only of ice, while the terrestrial planets began from planetesimals made only of rock and metal.What is the primary reason we divide the ingredients of the solar nebula into four categories (hydrogen/helium gas; hydrogen compound; rock; metal)?The temperature at which these materials condense into a solid varies considerably.According to our theory of solar system formation, which law best explains why the solar nebula spun faster as it shrank in size?According to our theory of solar system formation, which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size?About 2% of our solar nebula consisted of elements heavier than hydrogen and helium. False T/F All the planets in the solar system rotate (spin) in the same direction as they orbit the Sun. As the planetesimals grew, they became large enough to attract each other. In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the particular distance in the solar nebula from the central protostar where it is cold enough for volatile compounds such as water, ammonia, methane, carbon dioxide, carbon monoxide to condense into solid ice grains. T/F Within 4 AU of the sun, all planets have solid surfaces.T/F With the exception of Venus, planetary surface temperatures decrease at greater distances from the sunT/F Outside the frost line, planetesimals could form into larger objects due to the presence of both rock and ice.T/F A key clue to how the solar system formed is the observation that all the planets orbit close to the same plane.T/F Based on our theory of how our own solar system formed, we would expect that other solar systems would be quite common.T/F The Moon probably formed at the same time that Earth formed, rather like the formation of a double planet.T/F Most of Earth's water likely resulted from impacts with icy planetesimals that originated in the outer regions of the solar system.T/F Impacts were extremely common in the young solar system but are less common today.T/F Within the frost line, planetesimals were composed entirely of rock, and outside the frost line, planetesimals were composed entirely of ice.T/F All the planets in the solar system rotate (spin) in the same direction as they orbit the Sun.T/F The more massive planets in the solar system tend to be less dense than the lower mass planets.T/F All the planets in the solar system have at least one moon.T/F All planets orbit the Sun in the same direction (counterclockwise as viewed from above Earth's North Pole).T/F All four of the giant outer planets-Jupiter, Saturn, Uranus, and Neptune-have rings.T/F Oceans cover more of Earth's surface than land.Why do Earth rocks have much younger ages than most meteorites?Most Earth rocks have been melted and reformed since Earth formed from the solar nebula.Why can we assume that a rock sample containing argon-40 had none of this isotope when the rock initially formed?Argon-40 is a gas that does not combine with other elements, so it would not be present in a rock when it formed.Every 4.5 billion years, half of the atoms in a sample of uranium-238 will undergo radioactive decay and become atoms of lead-206. Beyond the frost line, where hydrogen compounds could condense, the solid particles included ices as well as metal and rock. What will you see?The light from the two stars will be blended together so that they look like one star.___________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths.If we want to confirm that a star's brightness alternately dims and brightens, we need ______________ observations of the star.