Light from the star Betelgeuse takes 640 years to reach Earth. How far away is Betelgeuse...

Question

Question

Light from the star Betelgeuse takes 640 years to reach Earth. How far away is Betelgeuse in units of light-years?

a. Betelgeuse is 980 light-years away.

b. Betelgeuse is 640 light-years away.

c. Betelgeuse is 1900 light-years away.

d. Betelgeuse is 520 light-years away.

science physics

Answer 1

Answer #1

Option (b) is the correct answer.

Explanation -

A light-year is a unit of distance. It is the distance that light can travel in one year.

1 light-year = 9.46 x 10^12 km

As mentioned in the problem, star Betelgeuse takes 640 years to reach Earth. So, its distance from the earth is 640 light-years.

Answer 2

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