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

Question

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The Answer of 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

A Planetary Nebula Has a Radius of 0 3×10133×10^{13}3×1013 Km and 1 Year Is Equal To

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