When does hydrogen first begin to fuse into helium in the star formation process?
A)when the cloud first begins to contract
B)when the thermal pressure is trapped at the center of the cloud
C)when the protostars undergoes convective contraction
D)when the protostar undergoes radiative contraction
E)only when the star reaches the main-sequence

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The Answer of When does hydrogen first begin to fuse into helium in the star formation process?
A)when the cloud first begins to contract
B)when the thermal pressure is trapped at the center of the cloud
C)when the protostars undergoes convective contraction
D)when the protostar undergoes radiative contraction
E)only when the star reaches the main-sequence

When Does Hydrogen First Begin to Fuse into Helium in the Star