The time taken for light to travel from a galaxy that is 10 Mpc away is:

Question

Quizplus · Accepted Answer

The speed of light is approximately 3 × 10⁸ m/s. 
1 Mpc is equivalent to 3.086 × 10¹⁹ meters. 
So, the distance to the galaxy in meters is:

10 Mpc × 3.086 × 10¹⁹ m/Mpc = 3.086 × 10²⁰ m.

The time for light to travel this distance is:

time = distance / speed 
time = (3.086 × 10²⁰ m) / (3 × 10⁸ m/s)

time = 1.029 × 10¹² s

Converting this to years:

time = 1.029 × 10¹² s × (1 year / 3.154 × 10⁷ s)

time = 3.26 × 10⁷ years

Therefore, the answer is D: 3.26 × 10⁷ years.

The Time Taken for Light to Travel from a Galaxy