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The Trapezium Cluster itself, first observed by Galileo as a group of stars, is an [[open cluster]] of eight known newborn stars, several of which are [[binary star|binaries]]. The cluster was created right out of the nebula and each of the stars are within 1.5 light years of each other. It may be part of the larger '''Orion Nebula Cluster''', which contain some 2,000 stars in total, spread over an area of 20 light years.
The Orion Nebula is the primary example of a stellar nursery where new stars are being born. Recent observations of the nebula have revealed approximately 700 stars in various stages of formation within the nebula. In addition , the Hubble has found over 150 proplys, or ([[protoplanetary disk|protoplanetary disks]] ) in the nebula<ref>http://adsabs.harvard.edu/abs/1996AJ....111.1977M</ref>. Such systems are considered to be the earliest stages of solar system formation. The large number located just in this one nebula is viewed as evidence that the formation of star systems is a common occurrence in the universe.
