The nearest star to the earth is proxima centuri. It is 1.295persecs or 4*10^16m

Question

The nearest star to the earth is proxima centuri. It is 1.295persecs or 4*10^16m from New York City. The distance to Perth on the exact other side of the globe is about 11,000mi. Given that 1mi =1609m, how many orders of magnitude further from New York is proxima centuri compared to Perth?
The nearest star to the earth is proxima centuri. It is 1.295persecs or 4*10^16m from New York City. The distance to Perth on the exact other side of the globe is about 11,000mi. Given that 1mi =1609m, how many orders of magnitude further from New York is proxima centuri compared to Perth?

Explanation / Answer

d of star = 4*10^16 m
d for perth = 11000 mi = 11000*1609 m = 1.77*10^7 m

ratio = d of star / d for perth
= (4*10^16 m)/(1.77*10^7 m)
= 2*10^9

Answer: 9 order of magnitude

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