| 词汇 | red-giant |
| 释义 | red giant noun[ C ] physics specializeduk /ˌred ˈdʒaɪ.ənt/ us /ˌred ˈdʒaɪ.ənt/ a very large cool star that gives out a reddish light红巨星 Astronomy albedo Andromeda Aquarius Aries asteroid galactic galaxy Gemini geostationary geosynchronous nova observatory orbit orbital Orion substellar sunspot supergiant supermassive supermoon Examples of red giantred giant First, when stars of at least 0.4 solar masses exhaust their supply of hydrogen, their outer layers expand to form a redgiant. Evolution towards the redgiant branch for the first time is very rapid while stars can spend much longer on the horizontal branch. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most stars retain more of their hydrogen after the first redgiant phase, and eventually become asymptotic giant branch stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is the first ionized nebula to be have been discovered around a redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Serpentis, a cool redgiant that pulsates between magnitudes 5.89 and 7.07 in 87 days. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Although many of those sources are expanding dust envelopes around redgiant stars, a few are found to be associated with solar-type stars. Sun-like stars will enter the redgiant branch as subgiants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Once a star has evolved sufficiently to become a redgiant, its circumstellar habitable zone will change dramatically from its main-sequence size. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star, which is estimated to be at least nine billion years old, has passed the redgiant phase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On an inspiration, they scan "inside" the redgiant star, and discover a truly ancient rocky world which the star had enveloped in its expansion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star is now approaching the end of its life, and has expanded its outer envelope to become a redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The s-process is a slow neutron capture of lighter elements inside pulsating redgiant stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This type of low-mass star has consumed the hydrogen at its core, evolved away from the main sequence, and passed through the redgiant stage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is believed that the surface of the star oscillates slightly, a common feature of redgiant stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of red giant 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. |
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