What Point Defines the End of the Pre-Main-Sequence Phase of a Star's

question 41

Multiple Choice

What point defines the end of the pre-main-sequence phase of a star's life and the start of the main-sequence phase?

• A) The star begins to expand and become a red giant.
• B) Convection begins in its interior.
• C) The star stops accreting mass from the interstellar cloud.
• D) Nuclear reactions begin in its core.

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Definitions:

Year

A period of approximately 365 days or 12 months, used for reckoning time in accordance with the Gregorian calendar.

Results of Race

Results of race typically refer to the final outcomes or standings of a competitive event, detailing the performance and positions of the participants.

Both

Used to refer jointly to two specified or implied subjects, objects, or issues.

Nonlinear Association

A relationship between two variables where the change in one variable does not produce a proportional change in the other variable.