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Glossary term: 土星

Description: 土星是来自太阳的第六颗行星,也是体积和质量第二大的行星。它是一颗气体巨行星,直径为 120,000 公里,是地球半径的 9.4 倍。土星的密度是太阳系行星中最低的,比地球上水的密度还低。它的质量是地球质量的 95 倍。

它与太阳的典型距离为 14 亿千米,约为 9.5 个天文单位(地球与太阳的距离)。土星绕太阳运行一圈需要 29.4 年。天文学家已经探测到 140 多颗围绕土星运行的卫星或天然卫星。在这些卫星中,土卫六是最大的卫星,也是太阳系中唯一拥有大量大气层的卫星。

土星以罗马农业之神的名字命名,被称为太阳系的宝石。肉眼可以看到它是天空中一个无光泽的光点。尽管它距离地球超过十亿公里,但用小型望远镜也能看到环绕它的美丽星环。

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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

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土星上淡褐色的云带和细长的灰色星环

土星

Caption: NASA/ESA 哈勃太空望远镜的宽视场相机3号于 2019 年 6 月 20 日观测到土星,当时这颗行星距离地球约 13.6 亿公里,是今年距离地球最近的行星。图像显示了土星表面的彩色气体条带以及由冰和岩石物质组成的突出星环。
Credit: 美国国家航空航天局、欧空局、A. Simon(戈达德太空飞行中心)和 M.H. Wong(加州大学伯克利分校) credit link

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银河从地平线上升起,映入眼帘的是树木、水和远处城市灯光的景色

流动的夜空

Caption: 2022 年国际天文学联合会 OAE 天体摄影竞赛 "延时天体图案 "类别荣誉奖。 这幅延时摄影作品是 2020 年 8 月在斯洛伐克拍摄的。通过在部分画面中固定天空与地球自转的相对运动,作为观众的我们可以体验到不同的视角。 银河系,我们的家园星系,在整段视频中清晰可见。银河附近明亮的天体是木星和土星,它们靠得很近,其中木星更亮。 这段视频还展示了业余天文学家用望远镜对准天空观测英仙座流星雨的互动过程。天文观测的一个遗憾是,有时云层会突然遮住整个天空。云雾出现的主要原因是雨后湿度较大。 天空中的大部分亮线都是由卫星造成的,但其中有些出现的时间很短,也不是很明显,它们是流星,因为这段视频是在英仙座流星雨高峰期前后拍摄的。
Credit: Robert Barsa/IAU OAE

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Over trees with thick trunks, the Milky Way, with several bright objects left and right, is bisected by a wide dark line.

Milky Way over Avenue of Baobabs

Caption: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image, taken from the Avenue of Baobabs, Morondava, Madagascar, in July 2017, shows the majestic band of the Milky Way, our home galaxy, together with a rich collection of constellations and asterisms: Crux, Centaurus, Scorpius, Sagittarius and the Teapot asterism. Towards the bottom left of the image we can see the Southern Cross and the pointer stars Alpha (the brighter of the two) and Beta Centauri, which help to distinguish it from similar-looking configurations. Some cultures in Africa associate the Southern Cross with a giraffe, while others associate the constellations with a pride of lions or even with the Tree of Life. Antares, the brightest star in the constellation Scorpius, is the orange-red star straight up from the middle baobab tree. To the Pokomo people from southwestern Kenya, Africa, the Milky Way is associated with the smoke emanating from a campfire lit by ancient people. The various people in South Africa, in contrast, have different star tales; the Khoikhoi from the region around Cape Town explained the colours of the red and white stars as red and white roots that were roasted on a fire and thrown towards the sky together with the ashes of the fire. The Xhosa from further east consider the Milky Way the raised bristle of a huge angry dog, while the Zulu from near Johannesburg interpret it as a stream of spears of their strongest warriors. Polynesian people, who were adept seafarers and navigators, see the constellation Scorpius as a fish hook, and refer to it as the demigod Maui’s Fish Hook. For the Djab Wurrung and the Jardwadjali people, the Southern Cross is part of a Dreamtime Story involving Tchingal, the Bram-bram-bult brothers (the pointer stars), their mother Druk (Delta Crux), and Bunya, the hunter who gets changed into a possum (Gacrux, red star at the top of the Southern Cross). In this image, the planets Saturn (the bright point above Antares) and Jupiter (the bright point at the bottom-right of the image close to the trunk of the baobab tree) are visible. Indigenous cultures have various stories associated with the planets, for example Kamilaroi and Wailan people associate Saturn with wunygal, a small bird. The Boorong people of Western Victoria associate Jupiter with Ginabongbearp, the chief of the old spirits (Nurrumbunguttias), who takes the totemic form of the sulphur-crested white cockatoo.
Credit: Amirreza Kamkar/IAU OAE

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一幅全天空图像展示的银河,犹如一条漫无边际的光河,只有中央一条斑驳的暗斑带将其打破。

横贯天顶的银河

Caption: 2022年国际天文学联合会(IAU)OAE天文摄影比赛静态天体图案类别获奖作品。 这幅全天图像展示的是2019年5月在日本长野看到的银河系越过天顶的景象。这种全天空图像可以用鱼眼镜头拍摄,也可以用地面上的凸面镜拍摄,后者也可以显示出拍摄者。 在这幅图像中可以看到夜空中最亮的几颗恒星,以及太阳系中的两颗巨行星——木星和土星。木星是本图底部最亮的一点,而土星则是银河系另一侧的另一个亮点,位于底部,紧挨着地平线。 在银河的正右方、木星的下方,我们可以看到一颗明亮的红色恒星——心宿二,它是日本星宿“心宿”的主星。日本星宿源于中国古代的星宿,只做了很小的改动,甚至没有改动。在这一传统中,“心宿”是“四象”之一“苍龙”的心脏,代表着春天。在巴比伦和希腊罗马的传统中,这个区域被认为是天蝎的心脏。在巴比伦宗教中,这颗星与母神的孩子李斯有关,但在希腊神话中,由于它的颜色,它与火星有关。红色也使这颗恒星在中国被称为“大火星”。我们知道,这种颜色是由它相对较低的温度造成的。 从心宿二向右移动,我们会看到天空中更靠北的部分。图像右下方靠近地平线的亮星是位于现代的牧夫座的大角星。心宿二及其周围天区被认为是苍龙的心脏,而大角星和角宿一(位于地平线之下)则是两个仅含有单星的星群,构成了苍龙的巨角。在图像右侧的地平线边缘,从上方向它指去的,是北斗七星的柄,它是大熊座的一部分。 银河右侧、图像中间上方的亮点是织女星,位于现代的天琴座。向银河的另一侧连一条线,在图像的下方一点,我们可以看到牛郎星,位于天鹰座。从那里我们可以再将一条线连到天鹅座最亮的恒星——牛郎星,这颗星在图像中的位置也稍高一些,完全被银河淹没了。这三颗明亮的恒星组成了北半球被称为“夏季大三角”的星群。
Credit: Ohnishi Kouji/IAU OAE

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The Milky Way over a cloudy landscape. A triangle of bright objects is visible on the left of the image.

Equatorial Milky Way

Caption: Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns: Equatorial Milky Way   Taken in Bromo-Tengger-Semeru National Park, Java Island, Indonesia, in March 2016, this image captures regions of the southern Milky Way and, at its left edge, the two planets Mars and Saturn. Mars appears orange and is similar in colour to the star Antares, whose Greek name — anti Ares — references this. Saturn is a little bit fainter than Mars, but clearly visible among the stars of Ophiuchus, above the Pipe Nebula and forming an isosceles triangle with Mars and Antares. Mars is on the top and Saturn is vertically below. Visible to the naked eye, both planets have significance in many cultures around the world. In Roman mythology Mars is the god of war and fertility, and Saturn the god of sowing and agriculture. Its Greek equivalent, the god Kronos, is also considered the regent of completion. Indigenous Australians, including the Kamilaroi and Wailan people, associate Saturn with “wunygal”, a small bird. Mars is called Iherm-penh (something burnt in flames) by the Anmatyerre people of the Central Desert, while the Kokatha people of the Western Desert associate Mars and the star Anatres with the red-tailed black cockatoo (Kogolongo). In the middle of this photograph, the most famous southern constellations are clearly recognisable: the Southern Cross (Crux), the pointer stars, Alpha and Beta Centauri, the dark Coalsack Nebula and the red Eta Carina Nebula, which is not visible to the unaided eye but is prominent in modern photographs. In the 19th century, the star eta Carinae had been the second-brightest star in the sky for some time, but since it varies irregularly, it has hardly been recognisable in recent decades, and its future visibility is unpredictable. Triangulum Australe is visible between the pointer stars and the Scorpion, and in the constellation of Centaurus, the bright globular star cluster Omega Centauri is clearly displayed. It was considered a “nebulous star” since antiquity and, thus, was listed in star catalogues for at least 2000 years. Only within the last century did astronomers discover that globular star clusters are in the halo of our galaxy and that this one consists of roughly 10 million stars. The dark regions in the Milky Way, which are cool, dense clouds of dust and gas, form the head and body of the Celestial Emu Tchingal. Together with the Southern Cross and the pointer stars, they appear in the Dreamtime stories of many Indigenous Australians. One story associated with the Djab Wurrung and the Jardwadjali people is part of a Dreamtime Story involving Tchingal, the Bram-bram-bult brothers (the pointer stars), their mother Druk (Delta Crux), and Bunya the hunter, who gets transformed into a possum (Gacrux, the red star at the top of the Southern Cross).
Credit: Giorgia Hofer/IAU OAE

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The bright Moon illuminates a beach. Three bright planets form a line below and to the right of the Moon.

To guard the Stars and the Sea Together

Caption: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns. This image composition is amazing. In the far background of the landscape we see a chain of mountains that seems to mirror the structure of the Milky Way in the sky above. The strong daylight-like colours of the landscape are caused by the Moon, the bright light at the top of the image. Taken in Kinabalu, Malaysia, in February 2019, this image shows the alignment of planets and the Moon, conveying the idea of the ecliptic as the central line of the Zodiac, the plane within which all planets orbit the Sun. The ecliptic is the central line of the Zodiac, so the region of about five to 10 degrees either side of the ecliptic is where the constellations of the Zodiac are located. Starting from the horizon towards the bottom left of the image we can see the planets Venus, Saturn and Jupiter. The planets have different cultural significance for people around the world, and are deeply embedded in social, religious and practical aspects of life. For example, Wardaman traditions of Indigenous Australians associate the planets with ancestor spirits who traverse the Celestial Road (ecliptic). The appearance and disappearance of planets in the sky are associated with various ceremonies. For example, when Venus starts being the “Morning star” after having been the “Evening star”, this marks the Banumbirr ceremony for the Yolnu people of Arnhem Land, in Australia. The image also shows the constellations Scorpius, Aquila, Lupus and Triangulum Australe, the asterism of the Teapot, and the two pointer stars Alpha and Beta Centauri. The constellations, asterisms and individual stars within them have significance in many different cultures. Malaysia, being close to the equator, has had connections to the north as well as to the south and almost the whole sky is visible over the course of the year. The star Antares is seen by the Kokatha people of the Western Desert as Kogolongo, the red tailed black cockatoo, while the Boorong refer to it as Djuit, the red-rumped parrot. The two stars which form the stinger of Scorpius (Shaula and Lesath), are called Karik Karik, the Australian Kestrel.
Credit: Likai Lin/IAU OAE

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The Milky Way appears as two vertical diffuse bands of light either side of a dark line, over a rocky outcrop.

The Pillar of Creation

Caption: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image shows the night sky over Tre Cime di Lavaredo, (Dolomites Natural Park), in the region of Veneto, Italy, in October 2021. The bright spot on the left-hand side is the planet Jupiter, appearing in the constellation Capricorn. To the right of Jupiter and below the two horn stars of Capricorn is the planet Saturn. Just above Jupiter we can see parts of Aquarius, one of the largest constellations and also part of the Zodiac. North of these constellations, left of the Milky Way, there are mostly faint stars. The brighter whitish one in the top left corner is Enif, a binary star in the constellation Pegasus. The Milky Way seems to emerge from a rock like celestial vapour. Roughly centred in the image are two bright stars left and right of the Milky Way: Altair and Vega, respectively. They seem to be separated by the galactic stream, as told in a popular Chinese folk story where they represent a loving couple. Today, in popular astronomy, the fairly bright star at the upper edge of the photograph is added to form a huge triangle with them, the Summer Triangle in the northern hemisphere. Altair is the brightest star of the Babylonian constellation Aquila, the Eagle. In ancient Babylon, it was said that the Eagle was carrying king Etana up in the air so that he could see Earth from above. Next to the Babylonian Eagle was the constellation of the Corpse, that returned only in Roman times when Ptolemy put it below the Eagle as the new sub-constellation “Antinous”. It is seen as the corpse (or soul) of the Roman emperor Hadrian’s favourite who had just died in the Nile. Vega is the bright white star to the right of the Milky Way. It forms part of the small constellation Lyra, famous for hosting the Ring Nebula, which is an impressive planetary nebula — a dying star blowing its gas into space. At the right edge of the image, three stars in a bent row appear rather prominently. This is the handle of the Big Dipper pointing downwards to a bright star close to the horizon: Arcturus, the bright star of the constellation Bootes (Greek: the Ploughman). This kite-like constellation is probably a pagan interpretation of the Babylonian god “Enlil” whose constellation also occupied that place in the sky. The Romans re-interpreted this figure as The Ox-Driver who controlled the Seven Oxen seen in the bright stars of Ursa Major. Directly right of Vega, there is the huge constellation Hercules and below it, directly to the left of Bootes, we find a half-circle of stars comprising the small constellation Corona Borealis, associated with Ariadne, daughter of King Minos of Crete in Greek culture. The lights seen in the bottom left side of the image are due to the reflection of artificial lights in the clouds.
Credit: Giorgia Hofer/IAU OAE

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