What's the best explanation for jovian planets farther from the Sun having less mass?
What will be an ideal response?
Answer: The differences in the sizes of the jovian planets are due to their capturing different amounts of gas from the solar nebula, since their cores are all about the same size. Icy planetesimals took longer to accrete in the outer solar system because they were more spread out there. Thus, more distant jovian planets didn't have as much time as Jupiter to capture gas from the solar nebula before the nebula was cleared by the solar wind.
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When a material is found to have no definite volume and no definite shape, what is the phase of the material?
a. Gas b. Liquid c. Plasma d. Solid
Which of the following statements applies in the final moments of the life of high-mass stars?
A. Around their cores, they have a series of nested shells, each made of a heavier element than the one surrounding it. B. The core temperature is about 2 billion degrees. C. Their outer layer is mainly hydrogen and helium. D. They have iron cores. E. All of these choices are correct.
Ice, when it is frozen year-round in the ground, is termed ________.
Which hypothesis concerning the formation of the Moon makes predictions that best fit the observed lunar data?
a. the large impact hypothesis b. the fission hypothesis c. the capture hypothesis d. the condensation hypothesis e. the regolith hypothesis