Order the following statements in the order of star formation. Star -- the center of the protostar gets hot enough for the fusion of hydrogen atoms into helium atoms to beginDisk -- gravity causes dense material to start spinning along a fixed axisStellar Nebula -- dense cloud of hydrogen and helium gasProtostar -- the center of the disk gains more mass and heat as it continues to spin fasterPlanetary debris -- left over material begins to condense into protoplanets and orbit around the newly formed star
