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:: Question about light speed and distance ::

 
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JensenBreck


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MessagePosté le: Mar 28 Nov - 12:00 (2017)    Sujet du message: Question about light speed and distance Répondre en citant

Hi,


I have been very interested in astronomy for many years, but just recently have i been reading more books, watching documentaries, reading articles and the like.  However one thing i cannot find is an answer i have regarding my following question.


So 1 light year is explained as ~ 5.9 trillion miles away. And every time i watch a documentary they say that if something is 5 light years away, then you are, "seeing 5 years into the past".  When a statement like this is made, are they implying you are seeing 5 light years in the past,  or 5 "earth years"?  If it is the latter, then how is this?  


Sorry if this question seems basic as compared to others, but among all the things that involve astronomy, light speed is one topic that puzzles me more than the rest.  Just have a hard time wrapping my brain around such an awesome concept.










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