Prime Timeline
   | Year | Event | 
   | 2337 | 
       ● [1]
         Yar is born on the Turkana IV colony planet. [1] | 
   | 2342 | 
         ● [1]
         Yar is orphaned when both parents where killed in a fire fight. She is raised by her sister, Ishara, until the age of fifteen. [1]
      
 | 
   | 2364 | 
         ● [1]
         The Enterprise-D arrives at a rendezvous with the USS Tsiolkovsky, which has been observing the collapse of a red giant star, to discover the entire crew dead. It is discovered that an infenction caused the crew to exhibit a loss of inhibition. The infection spreads to the Enterprise and incapacitates most of the crew, causing Lieutenant Yar to have a sexual liasion with Lieutenant Commander Data. The infection is ultimately overcome, though not before the Tsiolkovsky is lost in the collapse of the star. [1]
      
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Colour key
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References