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The distance that light travels through a vacuum in one year,[1] 1 light-year (9.5×1015 m).

References

  1. ^ Baumann, Mary K.; Will Hopkins, Loralee Nolletti, Michael Soluri, Steven Hawking (foreword) and Ray Villard (astronomy consultant) (2007). Cosmos: Images From Here to the Edge of the Universe. London: Duncan Baird Publishers. ISBN 1844834761 Check |isbn= value: checksum (help).  Cite uses deprecated parameter |coauthors= (help); Check date values in: |access-date= (help);
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