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This question already has an answer here:

I know what a "light year" means. However, I am very curious to know about the technique through which scientists are able to calculate the distance of various astronomical bodies from earth which are situated so far that it takes even light a huge amount to travel from there. I just want to know how they calculate distance ???

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marked as duplicate by Kyle Kanos, ACuriousMind, Martin, JamalS, Rob Jeffries Mar 26 '15 at 19:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ en.wikipedia.org/wiki/Cosmic_distance_ladder $\endgroup$ – lemon Mar 26 '15 at 15:20
  • $\begingroup$ @KyleKanos: I almost flagged that as a duplicate, but the emphasis in this post is on the most distant objects and I'm not sure that's covered by the proposed duplicate. $\endgroup$ – John Rennie Mar 26 '15 at 15:59
  • $\begingroup$ @JohnRennie: I quote from the accepted answer: especially Type 1a supernova allow us to measure the distance to even more distant galaxies and out to the edge of the visible universe. Seems like it's covered to me. $\endgroup$ – Kyle Kanos Mar 26 '15 at 16:03
  • $\begingroup$ I am sorry to be impatient while seeking the answer of my question, if I have searched for it properly I would have find the question whose link you posted in the answer. I have gone through the explanation of that question and its answer and now I know the answer of my query. Thank you guys! $\endgroup$ – Braj Bhushan Garg Mar 27 '15 at 4:15