1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How far away is it?

  1. Nov 15, 2009 #1
    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?
     
  2. jcsd
  3. Nov 15, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    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.
     
  4. Nov 15, 2009 #3
    No, that was the exact question.
     
  5. Nov 15, 2009 #4

    Delphi51

    User Avatar
    Homework Helper

    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook