NEBULAE & STAR CLUSTERS 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 Sigma Orionis star cluster Three of the objects (reddish, marked by triangles) in the sigma Orionis star cluster that may be free-floating planets. Credit: Zapatero Osorio, et al./Science A young open cluster, 1 to 5 million years old, that is part of the Orion OB Association, adjacent to the Horsehead Nebula; the star Sigma Orionis lies at its center. Within this cluster have been identified a number of free floating brown dwarf and large planet candidates. Related category    • NEBULAE AND STAR CLUSTERS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP