Measuring in light-years also allows astronomers to determine how far back in time they are viewing , Because light takes time to travel to our eyes. Everything we view during the dark in night has already been happened.
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I think it igneous or metamorphic rocks
not completely sure but I think its one of those.
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Google.
atleast trying to make it renewable as possible, not use it too much, not taking the non renewable one, possibly find a new place that have the enough resource and.. maybe going further into space to use it resource