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Examples ofprotostar
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The small dark areas in the photograph are believed to be protostars.
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This example is from Wikipedia and may be reused under a CC BY-SA license.When the protostellar cloud has approximately reached the stable condition of hydrostatic equilibrium, aprotostarforms at the core.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Theprotostar, at first, only has about 1% of its final mass.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Adopting larger ages allows protostars to radiate the same amount of energy over a longer time, reducing their average luminosity.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Infrared can also be used to detect protostars before they begin to emit visible light.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.There is mounting evidence that at least some massive protostars are indeed surrounded by accretion disks.
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This example is from Wikipedia and may be reused under a CC BY-SA license.It is associated with a massive (10 solar masses)protostar, which accretes gas from a disk that surrounds it.
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This example is from Wikipedia and may be reused under a CC BY-SA license.When destabilized, cloud fragments can collapse under the influence of gravity, to form aprotostar.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.If, however, the mass of theprotostaris less than about 0.08 solar mass, normal hydrogen thermonuclear fusion reactions will not ignite in the core.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.Within 50 million years, the pressure and density of hydrogen in the centre of theprotostarbecame great enough for it to begin thermonuclear fusion.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Theprotostaris now considered a young star since its mass is fixed, and its future evolution is now set.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Every eleven years, one of the protostars emits a neutron blast that the pilgrims consider a sacred event.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.This class consists of two groups of objects: protostars and premain sequence stars.
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This example is from Wikipedia and may be reused under a CC BY-SA license.While the surrounding matter is falling onto the central condensation, it is considered to be aprotostar.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Aprotostargrows by accretion, acquiring mass from its surrounding envelope of interstellar dust and gas.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Millimeter-wave emission line studies have also provided evidence for the infall of material onto an accretingprotostar.
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This example is from Wikipedia and may be reused under a CC BY-SA license.The outer envelope then accretes onto the centralprotostar.
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This example is from Wikipedia and may be reused under a CC BY-SA license.Aprotostarmay have too little mass to become a star.
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This example is from Wikipedia and may be reused under a CC BY-SA license.This star formation begins enshrouded in the collapsing cloud, blocking the protostars from sight but allowing infrared observation.
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Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.