A Planetary Nebula Has a Radius of 0 $3×10^{13}$ Km and 1 Year Is Equal To

question 19

Multiple Choice

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula (1 pc is equal to $3×10^{13}$ km and 1 year is equal to $3.15×10^7$ seconds.)

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

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