The average star spends ________ of its lifetime on the main sequence.
A) 1%
B) 2%
C) 10%
D) 20%
E) 90%
Correct Answer:
Verified
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
Q13: Protostars are difficult to observe because
A)the protostar
Q15: The carbon-nitrogen-oxygen cycle
A)operates at a slightly lower
Q16: Interstellar gas clouds may collapse to form
Q17: The H-R diagram main-sequence of stars has
Q18: Emission nebulae are also called _ because
Q19: The diagram below is an H-R diagram.
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