Look up: protostar

1. protostar
   Very dense regions (or cores) of molecular clouds where stars are in the process of forming.
   Found on http://skyview.gsfc.nasa.gov/help/dictio
   
   
2. protostar
   (from the article `nebula`) ...has been collapsing, it does not have a smooth density distribution but rather consists of a chaotic jumble of smaller clouds. These cloudlets ... ...of a molecular cloud, one or more of its cores become unstable and subject to gravitational collapse. Good arguments exist that the central ... Strong win...
   Found on http://www.britannica.com/eb/a-z/p/124
   
   
3. Protostar
   A `protostar`, existence of which for the first time was proposed and postulated by the Soviet (Armenian) physicist accessdate=2011-01-12-->--> is a large mass that forms by contraction out of the gas of a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in ...
   Found on http://en.wikipedia.org/wiki/Protostar