When Does a Protostar Become a True Star

question 57

Multiple Choice

When does a protostar become a true star?

• A)when the star is 1 million years old
• B)when the central temperature reaches 1 million Kelvin
• C)when nuclear fusion begins in the core
• D)when the thermal energy becomes trapped in the center
• E)when the stellar winds and jets blow away the surrounding material

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Definitions:

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The concentration of chlorine present in a substance, commonly measured in water to ensure safety and hygiene.

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A range of values derived from sample data that is likely to contain the true population parameter with a specified level of confidence.

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A statistic expressing the amount of random sampling error in a survey's results, indicating the range within which the true measure is expected to lie.