The distance to the Andromeda Galaxy is estimated at about 2 * 10⁶ light years. A light year is the distance traveled by light in one year; if the speed of light is 3 * 10⁸ m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 *10⁷ s) A) 10 * 10¹⁵ m B) 1 * 10¹⁸ m C) 2 * 10²² m D) 6 * 10¹² m

Question

Quizplus · Accepted Answer

To find the distance in meters, multiply the distance in light years by the distance light travels in one year: 2 x 10^6 light years x (3 x 10^8 m/s x 3.15 x 10^7 s/year) = 2 x 10^22 meters.

The Distance to the Andromeda Galaxy Is Estimated at About