Which event marks the birth of a star?
A) Formation of the planetary nebula
B) Fusion of hydrogen atoms into helium atoms
C) Collapse of an interstellar cloud
D) Formation of a photosphere
E) Instability in an interstellar cloud
Correct Answer:
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Q26: The "helium flash" occurs at what stage
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Q31: Just as a low-mass main sequence star
Q32: Which statement is TRUE about the interstellar
Q34: The stars found in nebulae like the
Q34: The density of interstellar dust is very
Q35: What temperature is needed to fuse helium
Q37: During the hydrogen shell-burning phase:
A)the star grows
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