| Rotation forces some of the matter to accumulate in a disk rotating around the protostar. |
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| The ejected material is channeled into narrow jets perpendicular to the disk, while material from the disk falls onto the protostar. |
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| Elongated chains of dust grains like these appear in the early stages of planet formation around a young protostar, according to a microgravity experiment inside a rocket. |
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| It became known as the Becklin-Neugebauer object and was later determined to be the first protostar to be directly observed. |
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| When the interior temperature of a protostar reaches a few million Kelvin it can begin to burn hydrogen and become a main-sequence star. |
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| In the core of what is now a protostar, hydrogen is burning, and heavier elements, the first of which is helium, are produced. |
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| The cloud slowly collapses due to gravity, a protostar is formed and soon the internal temperature rises high enough to ignite nuclear fusion. |
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| This is because the explosions produce shockwaves that can trigger the collapse of an interstellar cloud into a protostar. |
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| As the protostar continues to collapse due to gravity, it will attract more atoms and continually increase in mass and density. |
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| Jets and outflows carry off much of the energy and angular momentum that is released as the accretion disk spirals into the central protostar. |
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| Eventually, a protostar becomes dense enough to ignite nuclear reactions at its core, a sign that a bona fide star has been born. |
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| After all, the Sun was presumably once a protostar too. |
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| The protostar, which initially has a mass not much larger than Jupiter, continues to grow by accretion as more and more overlying material falls on top of it. |
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| When destabilized, cloud fragments can collapse under the influence of gravity, to form a protostar. |
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| This result proves that this effect is widespread and can be used as a new tool to study prestellar cores, where future stars and planets will form, and protostar environments too. |
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| Gyulbudaghian's nebula, also known as GM29, is illuminated by light emitted from the young energetic protostar PV Cephei. |
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| A protostar is formed from interstellar matter. |
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| Detailed calculations show that a protostar first appears on the Hertzsprung-Russell diagram well above the main sequence because it is too bright for its colour. |
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| Gravity causes the protostar to shrink, and the gravitational energy lost by the inflowing matter turns into heat, causing the centre of the globule to become very hot. |
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| Until then, the protostar shines from the heat energy released by the gas that continues to fall onto it, much of which originates in a rotating circumstellar disk. |
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| When it's born it's a protostar and it forms into a hyper giant star. |
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| They form at about the same time that a bright new star is born, and they proceed to feed a rich formula composed of gas and dust to the hungry baby star, or protostar. |
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