A Planetary Nebula Is Created

question 139

Multiple Choice

A planetary nebula is created

• A) over several hundred years, during mass transfer in a close binary star system.
• B) over a few thousand years or more, in a slow expansion away from a low-mass star, driven by a series of thermal pulses from helium fusion.
• C) in hours or less, during the explosion of a massive star.
• D) in seconds, during the helium flash in a low-mass star.

---

Definitions:

Agency

A legal relationship in which one party, known as the agent, is authorized to act on behalf of another, known as the principal, in dealing with third parties.

Legal Entity

An organization or structure that is recognized by law as capable of legal rights and obligations, such as a corporation or partnership.

Aggregate

A total or sum, often used in contexts involving the collection of different items or amounts into a single whole.

Contracts

Legally binding agreements between two or more parties that are enforceable by law.