Which of These Conditions Does NOT Characterize the Transition from a Pre-Main-Sequence

question 99

Multiple Choice

Which of these conditions does NOT characterize the transition from a pre-main-sequence star to a main-sequence star?

• A) The star begins fusing hydrogen into helium in its core.
• B) The star stops contracting.
• C) The gas and dust around the pre-main-sequence star largely dissipates.
• D) Helium burning becomes the principal energy-generating mechanism in the star's core.

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