A) Our theory is not quite correct because it cannot explain these exceptions.
B) Most of the exceptions are the result of giant impacts.
C) The exceptions probably represent objects that formed recently,rather than early in the history of the solar system.
D) The exceptions probably represent objects that were captured by our solar system from interstellar space.
E) The exceptions exist because,even though our theory is as correct as possible,nature never follows rules precisely.
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A) the temperatures at which various materials will condense from gaseous form to solid form
B) the atomic mass numbers of various materials
C) the locations of various materials in the solar nebula
D) the amounts of energy required to ionize various materials
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A) The original solar nebula happened to be disk-shaped by chance.
B) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system.
C) The laws of conservation of energy and conservation of angular momentum ensure that any rotating,collapsing cloud will end up as a spinning disk.
D) The Sun formed first,and as it grew in size it spread into a disk,rather like the way a ball of dough can be flattened into a pizza by spinning it.
E) Luck explains it,as we would expect that most other solar systems would not have all their planets orbiting in such a pattern.
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A) The meteorites sizes are just what we'd expect if metal and rock condensed and accreted as our theory suggests.
B) The meteorites appearance and composition is just what we'd expect if metal and rock condensed and accreted as our theory suggests.
C) Their overall composition is just what we believe the composition of the solar nebula to have been: mostly hydrogen and helium.
D) Their appearance and composition matches what we observe in comets today,suggesting that meteorites were once pieces of icy planetesimals.
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A) 50% hydrogen and helium,50% everything else
B) 98% hydrogen and helium,2% everything else
C) 98% hydrogen,2% helium
D) roughly equal proportions of hydrogen,helium,water,and methane
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A) It shows concentric gaps in the disk which are almost certainly regions being cleared as planets form.
B) We can see large planets forming.
C) The amount of energy being radiated by the star system indicates there must be planets present.
D) Data from ALMA does not support nebular theory,instead it is causing scientists to revise the theory.
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A) the theory predicts that the axis of rotation should not be perpendicular to the orbital plane of the planets,but it is.
B) the axis of rotation precesses slowly,which the theory does not predict.
C) the present-day rotation is in the opposite direction from that predicted by the theory.
D) the theory predicts that the Sun should have been rotating fast when it formed,but the actual rotation is fairly slow.
E) the theory predicts that the Sun should not have been rotating when it formed,but the Sun actually rotates today.
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A) hydrogen compounds;hydrogen and helium gas;metal;rock
B) hydrogen and helium gas;rock;metal;hydrogen compounds
C) hydrogen and helium gas;hydrogen compounds;rock;metal
D) hydrogen,water,methane,helium
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