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The Lower Edge of the Main-Sequence Band Is Known as ________

Question 21

Multiple Choice

The lower edge of the main-sequence band is known as ________ and represents the location in the H-R diagram at which stars begin their lives as main-sequence stars.


A) the Coulomb barrier
B) hydrostatic equilibrium
C) the birth line
D) the zero-age main sequence
E) the evolutionary track

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