{$mEDiAurl}
whAt is thE lECturE mAinly ABoutA．thE DiFFErEnCE BEtwEEn whitE DwArFs AnD BlACk DwArFs.
B．thE DiFFErEnCE BEtwEEn whitE DwArFs AnD Brown DwArFs.
C．thE FormAtion oF mAssivE stArs in our gAlAxy.
D．thE DisAppEAring proCEss oF stArs From outEr spAC