Loading...

Glossary term: 土星

Description: 土星是來自太陽的第六顆行星,也是體積和質量第二大的行星。它是一顆氣體巨行星,直徑為 120,000 公里,是地球半徑的 9.4 倍。土星的密度是太陽系行星中最低的,比地球上水的密度還低。它的質量是地球質量的 95 倍。

它與太陽的典型距離為 14 億千米,約為 9.5 個天文單位(地球與太陽的距離)。土星繞太陽運行一圈需要 29.4 年。天文學家已經探測到 140 多顆圍繞土星運行的衛星或天然衛星。在這些衛星中,土衛六是最大的衛星,也是太陽系中唯一擁有大量大氣層的衛星。

土星以羅馬農業之神的名字命名,被稱為太陽系的寶石。肉眼可以看到它是天空中一個無光澤的光點。儘管它距離地球超過十億公里,但用小型望遠鏡也能看到環繞它的美麗星環。

Related Terms:



See this term in other languages

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

This is an automated transliteration of the simplified Chinese translation of this term

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".

If you notice a factual or translation error in this glossary term or definition then please get in touch.

Related Media


土星上淡褐色的雲帶和細長的灰色星環

土星

Caption: NASA/ESA 哈勃太空望遠鏡的寬視場相機3號於 2019 年 6 月 20 日觀測到土星,當時這顆行星距離地球約 13.6 億公里,是今年距離地球最近的行星。圖像顯示了土星表面的彩色氣體條帶以及由冰和岩石物質組成的突出星環。
Credit: 美國國家航空航天局、歐空局、A. Simon(戈達德太空飛行中心)和 M.H. Wong(加州大學伯克利分校) credit link

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


銀河從地平線上升起,映入眼簾的是樹木、水和遠處城市燈光的景色

流動的夜空

Caption: 2022 年國際天文學聯合會 OAE 天體攝影競賽 "延時天體圖案 "類別榮譽獎。 這幅延時攝影作品是 2020 年 8 月在斯洛伐克拍攝的。通過在部分畫面中固定天空與地球自轉的相對運動,作為觀眾的我們可以體驗到不同的視角。 銀河系,我們的家園星系,在整段視頻中清晰可見。銀河附近明亮的天體是木星和土星,它們靠得很近,其中木星更亮。 這段視頻還展示了業餘天文學家用望遠鏡對準天空觀測英仙座流星雨的互動過程。天文觀測的一個遺憾是,有時雲層會突然遮住整個天空。雲霧出現的主要原因是雨後溼度較大。 天空中的大部分亮線都是由衛星造成的,但其中有些出現的時間很短,也不是很明顯,它們是流星,因為這段視頻是在英仙座流星雨高峰期前後拍攝的。
Credit: Robert Barsa/IAU OAE

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


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

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


一幅全天空圖像展示的銀河,猶如一條漫無邊際的光河,只有中央一條斑駁的暗斑帶將其打破。

橫貫天頂的銀河

Caption: 2022年國際天文學聯合會(IAU)OAE天文攝影比賽靜態天體圖案類別獲獎作品。 這幅全天圖像展示的是2019年5月在日本長野看到的銀河系越過天頂的景象。這種全天空圖像可以用魚眼鏡頭拍攝,也可以用地面上的凸面鏡拍攝,後者也可以顯示出拍攝者。 在這幅圖像中可以看到夜空中最亮的幾顆恆星,以及太陽系中的兩顆巨行星——木星和土星。木星是本圖底部最亮的一點,而土星則是銀河系另一側的另一個亮點,位於底部,緊挨著地平線。 在銀河的正右方、木星的下方,我們可以看到一顆明亮的紅色恆星——心宿二,它是日本星宿“心宿”的主星。日本星宿源於中國古代的星宿,只做了很小的改動,甚至沒有改動。在這一傳統中,“心宿”是“四象”之一“蒼龍”的心臟,代表著春天。在巴比倫和希臘羅馬的傳統中,這個區域被認為是天蠍的心臟。在巴比倫宗教中,這顆星與母神的孩子李斯有關,但在希臘神話中,由於它的顏色,它與火星有關。紅色也使這顆恆星在中國被稱為“大火星”。我們知道,這種顏色是由它相對較低的溫度造成的。 從心宿二向右移動,我們會看到天空中更靠北的部分。圖像右下方靠近地平線的亮星是位於現代的牧夫座的大角星。心宿二及其周圍天區被認為是蒼龍的心臟,而大角星和角宿一(位於地平線之下)則是兩個僅含有單星的星群,構成了蒼龍的巨角。在圖像右側的地平線邊緣,從上方向它指去的,是北斗七星的柄,它是大熊座的一部分。 銀河右側、圖像中間上方的亮點是織女星,位於現代的天琴座。向銀河的另一側連一條線,在圖像的下方一點,我們可以看到牛郎星,位於天鷹座。從那裡我們可以再將一條線連到天鵝座最亮的恆星——牛郎星,這顆星在圖像中的位置也稍高一些,完全被銀河淹沒了。這三顆明亮的恆星組成了北半球被稱為“夏季大三角”的星群。
Credit: Ohnishi Kouji/IAU OAE

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


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

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


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

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


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

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons