Protostar
A protostar is a very young star that is still gathering mass from its parent molecular cloud. It is the earliest phase in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years. The phase begins when a molecular cloud fragment first collapses under the force of self-gravity and an opaque, pressure-supported core forms inside the collapsing fragment. It ends when the infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion producing helium.
Polyhymnia
- 2011-06-17T00:00:00.000000Z
Stellarium
- 2010-03-06T00:00:00.000000Z
Æons
- 2012-11-01T00:00:00.000000Z
Imagination
- 2012-07-28T00:00:00.000000Z
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