J Jillian New member Oct 3, 2009 #1 uhm well i dont really get the idea of what concept means, so please help me >.< i jst need concepts for: -rotation -revolution -planets -nebular theory -density -nebula -light year -astronomical unit okay well thanks in advance by the way
uhm well i dont really get the idea of what concept means, so please help me >.< i jst need concepts for: -rotation -revolution -planets -nebular theory -density -nebula -light year -astronomical unit okay well thanks in advance by the way
