|3D map of cores|
A sudden phase change largely of helium gas into superfluid helium 3 occurs near 2 degrees kelvin inside massive protostellar cores, under strong magnetic fields and pressures. This is the brief one thousand year precursor stage for star birth.
New 3D Molecular Cloud Map Startles Astronomers by Revealing Different Interpretations on Why and How Stars Form:
Over 500 known "Protostellar cores" are in a precursor protostar stage. Cores are located in extremely dense and cold ~20 degree kelvin dense filamentary regions inside molecular clouds. Protostellar cores were found ranging from 1 to thousands of solar masses. Sarah Ragan writes "there is an underlying population of protostars similar to what is seen in these nearby molecular clouds, and another population of cores in even earlier stages." "Stars form deeply embedded in cold, dense molecular clouds. There is ten times more mass in the host clouds then already in the protostar cores."
|Precursors to high mass stars and clusters|