| 词汇 | protostar |
| 释义 | BETA Examples of protostarprotostar isn’t in the Cambridge Dictionary yet. You can help! The small dark areas in the photograph are believed to be protostars. From Wikipedia 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, a protostar forms at the core. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The protostar, at first, only has about 1% of its final mass. From Wikipedia 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. From 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. From Wikipedia 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. From 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. From Wikipedia 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. From Wikipedia 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 a protostar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If, however, the mass of the protostar is less than about 0.08 solar mass, normal hydrogen thermonuclear fusion reactions will not ignite in the core. From 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 the protostar became great enough for it to begin thermonuclear fusion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The protostar is now considered a young star since its mass is fixed, and its future evolution is now set. From Wikipedia 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. From 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. From Wikipedia 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 a protostar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A protostar grows by accretion, acquiring mass from its surrounding envelope of interstellar dust and gas. From Wikipedia 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 accreting protostar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The outer envelope then accretes onto the central protostar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A protostar may have too little mass to become a star. From Wikipedia 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. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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