A Planetary Nebula Has a Radius of 0

question 29

Multiple Choice

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3*10¹³km and 1 year is equal to 3.15*10⁷seconds.)

• A) 240 years
• B) 790,000 years
• C) 96,000 years
• D) 960 years
• E) 24,000 years

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Definitions:

Descriptive

Descriptive refers to the act of detailing or illustrating the characteristics of persons, objects, or events through words or statistics.

Correlational Research Methods

Research techniques that investigate the relationship between two or more variables, without inferring a causal relationship.

Cause-and-Effect Relationships

A principle that asserts one event (the cause) directly leads to another event (the effect).

Case Study Method

A research approach that involves the in-depth investigation of a single case, event, or individual to explore causation and find underlying principles.