Proxima Centauri: 4.2 Light Yrs from Sun

[S1CkFiSh]

The nearest star to the Sun is Proxima Centauri, a very faint component of the Alpha Centauri system. It takes light 4.2 years to reach us from Proxima. In the light's own frame, how far away is it?

 

[Delphi51]

Do you know what kind of motion light has?
You could look that up and the kind of motion would tell you what formula to use for that motion.

 

[S1CkFiSh]

No, that was the exact question.

 

[Delphi51]

So, does light move with constant speed or does it have accelerated motion?
If you don't know, look it up! When you know, write the formula(s) that apply to that kind of motion and see if one of them will find the answer you seek.