One of the nearest stars, Alpha Centauri, is 4.4 light-years from Earth.The time it takes light to travel from Alpha Centauri to us is
A) 1.25 seconds.
B) 8.3 minutes.
C) 4.4 years.
D) 600 years.
E) 2.2 million years.

Question

Quizplus · Accepted Answer

Light travels at a constant speed of approximately 299,792 kilometers per second. A light-year is the distance light travels in one year. Since Alpha Centauri is 4.4 light-years away, it takes light 4.4 years to travel from there to Earth.

One of the Nearest Stars, Alpha Centauri, Is 4