Sigma Orionis star cluster
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.
|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
AND STAR CLUSTERS
PLANETS AND SUBSTELLAR OBJECTS