What Would You Need to Measure in a Planetary Nebula

question 27

Multiple Choice

What would you need to measure in a planetary nebula to determine how long ago its parent star died?

• A) the mass of the white dwarf
• B) the mass and radius of the white dwarf
• C) the nebula's temperature and radius
• D) the nebula's radius and expansion velocity
• E) the composition of the gas in the nebula

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Definitions:

Memory Performance

The efficiency and effectiveness of a person's ability to store, retain, and recall information over time.

Long-Term Memory

The phase of memory responsible for the storage of information over an extended period, potentially a lifetime.

Biological Clock

An internal mechanism that regulates physiological and behavioral functions in a cyclical pattern, such as sleep-wake cycles or hormonal changes.

Night Shift

A work shift that takes place during the evening or overnight hours, typically outside of standard daylight hours.