The distance to a hypothetical galaxy is estimated at about 7 × 10⁶ light years.A light year is the distance traveled by light in one year;if the speed of light is 3 × 10⁸ m/s,about how far is it from our galaxy to this hypothetical galaxy? (1 year = 3.15 × 10⁷ s) A)7E+21 m B)1E+9 m C)7E+22 m D)7E+5 m

Question

Quizplus · Accepted Answer

We can calculate the distance by multiplying the speed of light by the time it takes to travel the distance of 1 light year:
distance = speed of light x time
time = 1 year = 3.15 × 10^17 s
distance = (3 × 10^8 m/s) x (3.15 × 10^17 s) = 9.45 × 10^25 m
So, the distance to the hypothetical galaxy is:
distance = (7 × 10^16 light years) x (9.45 × 10^25 m/light year) = 6.615 × 10^42 m
Therefore, the best choice is C, 7E+22 m.

The Distance to a Hypothetical Galaxy Is Estimated at About