What Would You Need to Measure for a Planetary Nebula

question 2

Multiple Choice

What would you need to measure for 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:

Linguistic Comprehension

The ability to understand spoken or written language.

Fluency

The ability to express oneself easily and articulately, especially in speaking or writing.

Symbols

Objects, figures, or markings used to represent ideas, concepts, or actions.

Language

The systematic, meaningful arrangement of symbols, which provides the basis for communication.