Look for Andromeda in the northern hemisphere autumn skies looking north.
在北半球秋季的天空中向北看仙女座。
The night skies of September and October herald the return of the constellation Andromeda. While not the showiest constellation in the sky, Andromeda harbors a fascinating deep-sky object and is the source of intriguing historical tales.
9月和10月的夜空预示着仙女座的回归。虽然仙女座不是天空中最华丽的星座，但它拥有一个迷人的深空天体，是有趣的历史故事的来源。
Finding the Andromeda Constellation 发现仙女座To find constellation Andromeda, first look for the W-shaped constellation Cassiopeia in the northern part of the sky. Andromeda is located directly next to Cassiopeia, and is also connected to a boxy shape of stars that make up the constellation Pegasus. Andromeda is visible to all northern hemisphere viewers and many, but not all, viewers south of the equator.
要找到仙女座，首先要在天空的北部寻找w型的仙后座。仙女座位于仙后座的正旁边，也与组成飞马座的四方形恒星相连。所有北半球的观测者和赤道以南的观测者都能看到仙女座。
Andromeda constellation is attached to Pegasus the flying horse in the sky. The constellation Pisces lies at her feet. Each one of these constellations has deep-sky objects nearby for observers to search out.
仙女座与天马座相连，天马座是天空中的飞马。双鱼座位于她的脚下。每个星座附近都有深空天体供观测者搜寻。
The History of Andromeda 仙女座的历史In ancient Greece and Rome, the stars of Andromeda were seen in combination with the stars of Pisces to form a goddess of fertility. The Arabic astronomers saw "Al Hut" — a fish. In ancient China, stargazers saw various figures of legend in Andromeda's stars, including a famous general and palaces for their emperors. In the south Pacific, where these constellations are low on the horizon, stargazers saw the stars of Andromeda, Cassiopeia, and Triangulum joined together as a porpoise.
在古希腊和罗马，仙女座的星星与双鱼座的星星结合在一起，形成了生育女神。阿拉伯天文学家看到了“Al Hut”——一条鱼。在古代中国，天文学家在仙女座的星星上看到了各种各样的传说人物，包括一位著名的将军和他们皇帝的宫殿。在南太平洋，这些星座在地平线上很低的地方，天文学家看到仙女座、仙后座和三角座的星星像海豚一样连在一起。
The Brightest Stars of Andromeda 仙女座最亮的星星Andromeda Constellation has four bright stars and numerous dimmer stars. The brightest is called α Andromedae, or Alpheratz. Alpheratz is a binary star located less than 100 light-years away from us. It is shared with Pegasus, although it's not formally part of that constellation.
仙女座有四颗明亮的恒星和许多暗淡的恒星。最亮的一颗被称为α仙女座，或称Alpheratz。阿尔弗拉兹是一颗距离我们不到100光年的双星。它与飞马座共享，尽管它不是正式的星座的一部分。
The official IAU chart outlines the area that contains Andromeda constellation. It also shows nearby deep-sky objects.
国际天文学联合会的官方图表勾勒出了仙女座所在的区域。它还显示了附近的深空物体。
The second-brightest star in Andromeda is called Mirach, or β Andromedae. Mirach is a red giant lying about 200 light-years away, located at the foot of a trio of stars that appear to lead to Andromeda's most famous deep-sky object: the Andromeda Galaxy.
仙女座中第二亮的恒星被称为Mirach，或β仙女座。米拉奇是一颗红巨星，距离我们约200光年，位于三颗恒星的底部，这三颗恒星似乎通往仙女座最著名的深空天体:仙女座星系。
Deep Sky Objects in Constellation Andromeda 仙女座的深空天体The most famous deep sky object in the northern hemisphere sky is the Andromeda Galaxy, also known as M31. This object is a spiral galaxy that lies about 2.5 million light-years away from us. It is heavily populated with up to 400 billion stars and is thought to have two black holes at its heart.
北半球天空中最著名的深空天体是仙女座星系，也被称为M31。这个物体是一个螺旋星系，距离我们大约250万光年。它拥有多达4000亿颗恒星，人们认为它的中心有两个黑洞。
The Andromeda Galaxy is the most distant object that can be spotted from Earth with the naked eye. To find it, head out to a dark observation location, then locate the star Mirach. From Mirach, trace a line out to the next stars. M31 will look like a faint smudge of light. The best way to look at it is through binoculars or a telescope, you will be able to make out the oval shape of the galaxy. It will appear to be facing you "edge-on."
仙女座星系是地球上肉眼能观测到的最远的天体。要找到它，请前往一个黑暗的观测地点，然后找到米拉奇星。从米拉奇开始，沿着一条线延伸到下一个星球。M31看起来像一个微弱的光点。最好的观测方法是通过双筒望远镜或望远镜，你将能够分辨出星系的椭圆形。它看起来是“面朝上”的。
At 2.5 million light-years, the Andromeda Galaxy is the closest spiral galaxy to the Milky Way. The term "light-year" was invented to handle the immense distances between objects in the universe. Later, "parsec" was developed for truly huge distances. Adam Evans/Wikimedia Commons.
仙女座星系距银河系250万光年，是离银河系最近的螺旋星系。发明“光年”一词是为了描述宇宙中物体之间的巨大距离。后来，“秒差差距”被开发出来用于真正的远距离。亚当·埃文斯/维基共享资源。
In the 1920s, the Andromeda Galaxy was known as the Andromeda Nebula, and for a long time, astronomers thought it was a nebula inside our own galaxy. Then, a young astronomer named Edwin Hubble took a look at it through the 2.5-meter Hooker telescope at Mount Wilson in California. He observed Cepheid variable stars in Andromeda and used Henrietta Leavitt's "period-luminosity" relation to determine their distance. It turned out that the distance was too great for the so-called nebula to be in the Milky Way. The stars had to be located in a different galaxy. It was a discovery that changed astronomy.
在20世纪20年代，仙女座星系被称为仙女座星云，在很长一段时间里，天文学家认为它是我们银河系内的一个星云。后来，一位名叫埃德温·哈勃的年轻天文学家通过位于加州威尔逊山的2.5米胡克望远镜观察了它。他观测了仙女座的造父变星，并利用亨丽埃塔·莱维特的“周期-光度”关系来确定它们的距离。事实证明，所谓的星云距离太远，不可能在银河系中。这些恒星必须位于不同的星系中。这一发现改变了天文学。
More recently, the orbiting Hubble Space Telescope (named in Hubble's honor) has been studying the Andromeda Galaxy, taking detailed images of its billions of stars. Radio astronomers have mapped sources of radio emissions within the galaxy, and it remains an object of intense observation.
最近，绕轨道运行的哈勃太空望远镜(以哈勃命名)一直在研究仙女座星系，拍摄了数十亿颗恒星的详细图像。射电天文学家已经绘制了星系内射电发射源的地图，它仍然是一个密集观测的对象。
Andromeda and the Milky Way colliding, as seen from the surface of a planet inside our galaxy.
仙女座和银河系碰撞，从我们星系内的一颗行星表面看到的景象。
In the far future, the Milky Way and Andromeda galaxies will collide. The collision will form a massive new galaxy that some have dubbed "Milkdromeda."
在遥远的未来，银河系和仙女座星系将发生碰撞。这次碰撞将形成一个巨大的新星系，一些人将其命名为“Milkdromeda”。
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