1.
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Why do star clusters provide excellent tests for theories of stellar evolution?
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2.
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How does a "black dwarf" star form?
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3.
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What is the name for a pair of nuclear-burning stellar cores surrounded by a single continuous common photospheric envelope?
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4.
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What is the physical size of a typical white dwarf star?
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5.
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What is the region of the Hertzsprung–Russell diagram known as the "horizontal branch"?
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6.
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What is the region of the Hertzsprung–Russell diagram known as the "red giant branch"?
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7.
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Why do high-mass stars move on the H–R diagram approximately horizontally after they leave the main sequence, whereas low-mass stars evolve off the main sequence so that they move vertically?
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8.
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What is the definition of the term "main-sequence turnoff"?
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9.
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What is the characteristic pattern observed among the ages of the globular clusters associated with our Galaxy?
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10.
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What would be the radius of a red giant star with an observed surface temperature of 3200 kelvins and a luminosity of 1000 solar units?
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A star is located on the asymptotic giant branch of the H–R diagram
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12.
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As a star exhausts the hydrogen in its core and the core contracts, the star becomes
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13.
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A planetary nebula is
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14.
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Which of the following stars is most dense?
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15.
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A stellar model is
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16.
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In its last stage of evolution, the Sun will become a
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17.
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What type of main-sequence stars live the longest?
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18.
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Why don't stars live forever?
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19.
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What is the main-sequence (hydrogen core burning) lifetime for stars like the Sun?
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20.
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What is the helium flash?
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