Question

if a alien lived for 4 light years away and came to earth in how long is that

Answer 1

Answer:

268,447,489 years

Step-by-step explanation:

We can use dimensional analysis to solve this problem.

There are approximately 5.879 x 10^12 miles/ light year

Therefore, 4 Ly (5.879 x 10^12 miles / Ly) = 2.3516*10^13 miles.

We are given a speed of 10 miles/hr

So, 2.3516 x 10^13 miles (1 hr/10 mi)(1 day/24 hrs)(1 yr/365 days) = 268447488 years or 2.684 x 10^8 years.