The "Zero-Age Main Sequence" Describes the Sequence of Stars in the Hertzsprung-Russell

question 102

Multiple Choice

The "zero-age main sequence" describes the sequence of stars in the Hertzsprung-Russell diagram that

• A) contain no processed elements (elements heavier than hydrogen or helium).
• B) are just beginning to convert helium into carbon in their cores.
• C) have just collapsed from the interstellar medium.
• D) have just become stable objects.

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Definitions:

Technical Drawing

A precise and detailed drawing, usually created by draftsmen or engineers, used to fully and clearly define requirements for engineered items.

Symbol

A graphical element used on drawings or in documentation to represent a specific concept, operation, or component without the need for textual explanation.

Squareness

The degree to which two surfaces or lines form a perfect 90-degree angle, indicating precision and alignment.

Roundness

A geometric tolerance that limits the amount by which the surface of a part can deviate from a perfect circle.