Question

If we travel with the speed of light. how many years it take to reach Andromeda galaxy​

Answer 1

Answer:

2.5 million years. Although it may be one of the closest galaxies to our own, since the Andromeda Galaxy is 2.5 million light years distant it would take 2.5 million years to get there if (and it's a huge 'if') we could travel at the speed of light..

Answer 2

Answer:

2.5 million years

Explanation:

A way to do this is space travel using constant acceleration. Traveling to the Andromeda Galaxy, 2.54 million light years away, would take 28 years on-ship time with a constant acceleration of 1g and a deceleration of 1g after reaching half way, to be able to stop.