تبادلۂ خیال:ثقب اسود

وکیپیڈیا سے

wikipedia has done a great job in establishing a authentic source of information of encyclopedia in urdu language that is really un parallled i have ever seen on the web. Wikipedia no doubt deserves the congratulations from all urdu readers on reaching around the covered topics. Wikipedia has taken utmost care about the linguidtic values that could be thought possible.