protostellar造句
Alargecloudofgasanddustbeginstocongealgravitationally,startsrotating,andeventuallyflattensintoanobjectcalledaprotostellardisk.Theabsenceofprotostellarcloudmaterialandthelowvelocityofthestarsshowstheyc...
Alargecloudofgasanddustbeginstocongealgravitationally,startsrotating,andeventuallyflattensintoanobjectcalledaprotostellardisk.Theabsenceofprotostellarcloudmaterialandthelowvelocityofthestarsshowstheyc...