#1 – Light-year is a very long time
via upload.wikimedia.org complain
A light year is a way of measuring of the distance that a ray of light travels in a year. Light travels at a speed of about 300,000 kilometers per second, respectively, light year is equal to about 9.5 billion kilometers. With this unit, we can measure the distance from the Earth to the stars.
#stars , #comet , #sky , #astronomy , #planet , #earth , #moon , #pole_star , #black_hole , #Big_Dipper , #light_year , #sun
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