The distance to the nearest large spiral galaxy, the Andromeda galaxy, is 2.4 *10²² m. How long does it take light to travel from Andromeda to us? A) 4.4 years B) 360 years C) 1.2 thousand years D) 2.5 million years E) 4.5 billion years

Question

Quizplus · Accepted Answer

We can use the formula: 
time = distance / speed of light

The distance to Andromeda is given as 2.4 × 10^19 m. The speed of light is approximately 3 × 10^8 m/s.

Plugging in the values, we get:

time = (2.4 × 10^19 m) / (3 × 10^8 m/s) 
time = 8 × 10^10 s

Converting this to years by dividing by the number of seconds in a year (3.16 × 10^7 s/year), we get:

time = (8 × 10^10 s) / (3.16 × 10^7 s/year) 
time = 2.5 × 10^3 years

Therefore, it takes light approximately 2.5 million years to travel from Andromeda to us. The answer is D.

The Distance to the Nearest Large Spiral Galaxy, the Andromeda