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!

Light year question?

  1. Mar 11, 2009 #1
    1. The problem statement, all variables and given/known data
    If a star explodes 30 light years from the earth when will we be able to see it?


    2. Relevant equations

    one light year = 9.47 x 1012km
    speed of light = 3.00 x 108m/s

    3. The attempt at a solution
    the answer in my workbook says 30a but idk what the value of a is
     
  2. jcsd
  3. Mar 11, 2009 #2
    The definition of light year tells us that light will take 30 years to travel that distance, so the answer is indeed 30 years.
     
  4. Mar 11, 2009 #3

    Astronuc

    User Avatar

    Staff: Mentor

    a could be an abbreviation for annum (year) or anni (years).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Light year question?
  1. Light years (Replies: 1)

Loading...