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    Not sure how to do the first question. I know I have to calculate the speed. Is it d=vt or a different equation. I think I need to convert 21 years into seconds.
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    I know light year is distance, do I need to convert it into anything and Earth years (time) into anything? or is it ok to just substitute them in the equation?
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    21 is twice 10.5, therefore it must travel at half of a light-year per year, which is half C, which is 1.5*10^8 ms^1.
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    For c i) I dont know which answer is right? -3.1 ly or 10.5 ly?*
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    Can someone help?
 
 
 
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