Protostar | 社區大學終身學習網
Aprotostarisaveryyoungstarthatisstillgatheringmassfromitsparentmolecularcloud.Theprotostellarphaseistheearliestoneintheprocessof ...
Early stage in the process of star formation
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.[1] For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years.[2] 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.
History[edit]The modern picture of protostars, summarized above, was first suggested by Chushiro Hayashi in 1966.[3] In the first models, the size of protostars was greatly overestimated. Subsequent numerical calculations[4][5][6] clarified the is...
LINE Protostar 新星計劃 | 社區大學終身學習網
LINE 新星計劃 | 社區大學終身學習網
Protostar | 社區大學終身學習網
PROTOSTAR | 社區大學終身學習網
Protostar Education 博星教育 | 社區大學終身學習網
Protostar 博星教育 | 社區大學終身學習網
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