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Glossary term: 恒星

Description: 恒星是由等离子体——与电子分离的原子核——构成的球体。恒星自身的引力将内部的等离子体束缚在一起,而恒星核心区域的核聚变过程产生的内压阻止了其自身的塌缩。天文学家对物理学术语的使用不太严格,通常将“气体”和“等离子体”互换使用,因此也将恒星称为气体球。在恒星的大气层中,等离子体可能只是部分电离的,甚至包含一些未电离的原子,这取决于恒星的温度。

离地球最近的恒星是太阳。

在更广泛的意义上,“恒星”一词包括核聚变尚未开始的原恒星,以及中子星或白矮星等恒星遗迹。这些恒星遗迹并不是简单的等离子体球——白矮星在冷却数十亿年后会结晶成一种不同寻常的固体,而中子星则与巨大的原子核非常相似。

无论是用肉眼还是通过光学望远镜观察,恒星都是夜空中最明显的天体。在宇宙中,恒星通常存在于星系中,每颗恒星一般都伴随着一颗或多颗行星。研究恒星如何形成和演化是天体物理学的一个重要分支领域。

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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On the outskirts of a cluster of galaxies is an arc of light. On this arc is a dot, an image of one of the first stars

A gravitational lens magnifies one of the first stars

Caption: This image zooms in on a star formed within the first billion years after the birth of the Universe (at a redshift of 6.2). The Hubble Space Telescope detected this light using a technique called gravitational lensing. A massive galaxy cluster between the observer and the imaged star creates a distorted and warped image of the parent galaxy and reveals its features.
Credit: NASA, ESA, B. Welch (JHU), D. Coe (STScI), A. Pagan (STScI) credit link

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Over a watery field, Orion is shaped like a bow-tie turned 45 degrees. The bright star Sirius is in the image's left half

Watchtower and Paddy Fields Under the Starry Sky

Caption: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image, taken in April 2022, shows the sky over a plantation field around a century-old watchtower guarding a village in the province of Guangdong, China. Throughout the ages, the sky has been used as a tool for navigation and also as a calendar. By watching the apparent movement of the stars, it is possible to follow the passing of time, thereby understanding the change of the seasons which in turn helps to plan out the best timings of agricultural work. The most prominent constellations in this image are Orion and Canis Major, the Great Dog. Commonly associated with a giant hunter in Greek mythology, Orion is followed by his hound in the shape of the constellation Canis Major. In China, the seven bright stars of the constellation Orion are paradoxically called Three Stars (Shen) and this is one of the 28 Lunar Mansions. The Babylonian pre-zodiac, the so-called “Path of the Moon”, had 17 constellations and included Orion (therein named “True Shepherd of the Heavens”). This is not really surprising because, even in the system of the 88 modern constellations, the Moon sometimes stands in the constellation Orion. The modern constellation boundaries were defined in the 1920s in such a way that the area of Orion ends a half degree south of the ecliptic, in order to avoid the Sun entering it. Still, the Moon and the planets do occasionally. Therefore, Orion is part of the Zodiac (a stripe 5 to 10 degrees around the ecliptic), part of the path of the Moon and, of course, also used by many cultural calendars all over the world. Sirius, the bright star in the left half of the photograph, is the brightest star in the night sky, and has been used by many indigenous cultures to determine their calendars; the Egyptians awaited the Nile flood with Sirius’s heliacal rise, while the Romans connected its reappearance after its invisibility in daylight with the hottest summer time. In Old China, Sirius was considered a single-star asterism called The Wolf. The adjacent area was called The Market for Soldiers and the area in the southern part of Canis Major was imagined as the Bow with an Arrow. The reddish bright star in the top right corner is Betelgeuse, a red supergiant and one of the largest stars that can be seen with the naked eye. Orion’s Great Nebula below Orion’s Belt should be mentioned, but also the fainter huge red arc that is called Barnard’s Loop is clearly shown in this photograph. This galactic nebula and the circular red nebula around Orion’s not-so-bright head are both parts of star-forming regions, while the red nebula to the upper left of Orion is the Rosette Nebula in the unrecognisable constellation of Monoceros.
Credit: Likai Lin/IAU OAE

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