STELLAR ASTROPHYSICS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site turnoff point The point on the Hertzsprung-Russell diagram at which stars in a cluster depart from the main sequence. The brighter the turnoff point, the younger the cluster age. The turnoff mass is the least mass of a star (in a group) that has had time to begin evolving away from the main sequence. Related category    • STELLAR ASTROPHYSICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History BACK TO TOP