What Would You Need to Measure About a Planetary Nebula

question 65

Multiple Choice

What would you need to measure about a planetary nebula (see the image below) 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

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Definitions:

Main Term

The primary or most significant word or expression that describes the central concept in documentation, indexing, or searching of data.

Underlying Condition

A medical condition that preexists or contributes to the severity of another medical issue.

Hypertension

Hypertension is a condition characterized by consistently high blood pressure, which increases the risk of heart disease, stroke, and other health problems.

Neoplasm

An abnormal growth of tissue, which can be benign or malignant (cancerous).