Helium flash occurs
A) because helium is very explosive and cannot be controlled when the nuclear reactions occur.
B) because degenerate electrons in the core do not allow the core to expand as it heats up.
C) in Cepheid variables.
D) in stars with masses less than 0.4 M.
E) none of the above.
Correct Answer:
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Q2: Stars within a cluster that are at
Q2: If the stars at the turnoff point
Q3: The Crab nebula is
A)a planetary nebula.
B)a Bok
Q5: Star clusters are important to our study
Q8: Which of the following nuclear fuels does
Q9: As a main-sequence star exhausts hydrogen in
Q10: In star clusters, the _ stars are
Q11: A star will experience a helium flash
Q18: Giant and supergiant stars are rare because
A)they
Q20: A(n) _ is a collection of 105
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