Astronomy Chapter Six

20 Questions  I  By Moonshark13
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1.  The first planets around other Sun-like stars were discovered
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2.  What kind of material in the solar nebula could remain solid at temperatures as high as 1,500 K, such as existed in the inner regions of the nebula?
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3.  Based on our current theory of Earth's formation, the water we drink comes from
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4.  Which of the following has not been detected around other stars in the Galaxy?
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5.  Why did the solar nebula flatten into a disk?
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6.  What is astrometry?
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7.  Which is the densest planet in the solar system?
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8.  Why did the solar nebula heat up as it collapsed?
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9.  Approximately how many other planetary systems have been discovered to date?
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10.  Which of the following observations indicates that conditions on Mars may have been suitable for life in the past?
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11.  The heavy bombardment phase of the solar system lasted
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12.  What are the main constituents of the jovian planets?
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13.  The age of the solar system can be established by radioactive dating of
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14.  Which planet search technique is currently best suited to finding Earth-like planets?
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15.  What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
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16.  According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
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17.  According to our theory of solar system formation, why do we find some exceptions to the general rules and patterns of the planets?
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18.  Which planet search technique is currently best suited to finding Earth-like planets?
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19.  What percentage of the solar nebula's mass consisted of hydrogen and helium gases?
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20.  Which of the following are relatively unchanged fragments from the early period of planet building in the solar system?
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