Euan Mason

  1. How are light years a valid measurement of distance?

    by , 01-26-2013 at 08:48 AM
    Quote Originally Posted by Euan Mason View Post
    A light year is the distance light travels in one year, and it doesn't change with the sensitivity of a light receptor. On the other hand, determining the distance to an object is another matter, and generally involves some assessment of light flux (the amount of light received by a surface perpendicular to the light source), and also some knowledge of the actual amount of light emanating from the object.

    I really love the story of Jean-Philippe Lois de Cheseaux, an 18th century
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