What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
A) the rapid outward flow of gas
B) the rapid inward flow of the gas
C) the high temperature of the gas
D) the high density of the gas
E) c and d
Correct Answer:
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Q2: _ is the thermonuclear fusion of hydrogen
Q3: The proton-proton chain
A) combines two hydrogen nuclei
Q3: The visual pink glow of the Great
Q4: Which of the following is NOT evidence
Q5: The lower edge of the main-sequence band
Q8: Opacity is
A)the balance between the pressure and
Q9: _ occurs when most of the material
Q10: There is a main-sequence mass-luminosity relation because
A)helium
Q11: Due to the dust in the interstellar
Q12: The free-fall contraction of a molecular cloud
A)can
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