# True/False relativity question.

## Homework Statement

The star alpha centauri is 4.25 light years from us, so it takes its light 4.25 years to reach earth. It is impossible, in principle, for any rocket from earth ever to reach this star in less than 4.25 light years.

## The Attempt at a Solution

My first answer was that the statement was false as length contraction would make the journey distance shorter for rockets F.O.R and the accepted answer is true, which leads me to the conclusion that they must mean 4.25years in earth's F.O.R

I would like to know how I could identify in which frame they requested the answer in the problem above.

tiny-tim
Homework Helper
hi bayan!
The star alpha centauri is 4.25 light years from us, so it takes its light 4.25 years to reach earth. It is impossible, in principle, for any rocket from earth ever to reach this star in less than 4.25 light years.

I would like to know how I could identify in which frame they requested the answer in the problem above.

the facts given in the question are clearly written in the earth frame, so you should assume that the question itself is also

hi bayan!

the facts given in the question are clearly written in the earth frame, so you should assume that the question itself is also

Thanks for your reply, so unless there is a specified frame I should just use the one with respect to which data is given? Also is my answer of saying that statement is "false" wrong?

tiny-tim