INTERSTELLAR & INTERPLANETARY MATTER 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 presolar grains Microscopic grains of matter which existed in the interstellar cloud from which the Sun formed. They survived the collapse of the solar nebula and also the subsequent formation of planetesimals because they consist of refractory minerals. Presolar grains are found in the fine-grained matrix of primitive meteorites. Related category    • INTERSTELLAR AND INTERPLANETARY MATTER Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP