Light at pace a of 299 792 458 m/s is the fastest which we human kind knows. How do they measure stellar objects in terms of light years, say a star is at a distance of 100 light years. Since, a light beam takes 100 years to reach earth observatory.
Florian Glodeanu
You can find plenty of sites answering the question.
An example is: http://www.talkorigins.org/faqs/astronomy/distance.html
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