- 阿啵呲嘚
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he Milky Way Galaxy, commonly referred to as just the Milky Way, or sometimes simply as the Galaxy, is the galaxy in which the Solar System is located. The Milky Way is a barred spiral galaxy that is part of the Local Group of galaxies. It is one of billions of galaxies in the observable universe. Its name is a translation of the Latin Via Lactea, in turn translated from the Greek Γαλαξu03afαu03c2 (Galaxias), referring to the pale band of light formed by stars in the galactic plane as seen from Earth (see etymology of galaxy).
Some sources hold that, strictly speaking, the term Milky Way should refer exclusively to the band of light that the galaxy forms in the night sky, while the galaxy should receive the full name Milky Way Galaxy, or alternatively the Galaxy.[9][10][11] However, it is unclear how widespread this convention is, and the term Milky Way is routinely used in either context.
银河系(Milky Way)是太阳系所处的星系。是一个由2,000多亿颗恒星、数千个星团和星云组成的棒涡星系系统,它的直径约为100,000多光年,中心的厚度约为6,000多光年。太阳系属於这个庞大星系的恒星之一,而我们居住的地球则属於太阳系中的一个行星。过去它被认为与同处于本星系团的仙女座大星系一样,都是旋涡星系,但最新研究指出银河系实际上为一棒旋星系(barred spiral galaxy)。因为它像一条流淌在天上闪闪发光的河流一样,古称银河、天河、天汉,北半球来说夏季最明显看到银河(在天蝎座、人马座延伸至夏季大三角,甚至仙后座),冬季的那边银河很黯淡(在猎户座与大犬座)。
- wio
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科学家探测发现,来自太空的有机分子,是从最简单的水、氨、甲烷、氢化物、乙醇之类化合物,到含有更多结构复杂的物质。从陨石中找出的七十多种核酸,与地球生命核酸进行结构比较后,发现有8种能完全吻合。2001年,美国宇航局艾姆斯研究中心的研究人员首先在陨石中发现了人类生命不可缺少的糖化合物,并确定它来自于太空。
Scientists to detect, from space organic molecules, from the most simple water, ammonia, methanol, ethanol hyride and such to contain more compounds, complicated structure of the material. From meteorites find the nucleic acid, and more than 70 different life on earth structure based on the comparison, nucleic acid found have 8 kinds can perfectly. In 2001, the NASA Ames research center"s research staff who first in meteorites found the human life indispensable sugar compounds, and make sure it from space.
In 2002, the scientists through radio telescope observations, the first time in the center of the Milky Way galaxy zone of gas and dust cloud was found in dehydrogenation glycol - a to form of living organisms sugar molecules. The regiment gas cloud is the come-into-being stars are an integral part. Here dowsed sugar molecules, means of this kind of composition organism chemicals may have appeared in the world before existed in around stars. In the interstellar clouds containing twenty different chemical molecules, with a few consists of 8 or 8 or above of atoms complex molecules. Sugar molecule can be found here that organic molecules can be extremely difficult conditions of synthesis. Sugar can support life, when carbohydrate material and organic hydrogen base acid as celestial collision, large came to earth and enrichment up, just for the emergence of life provides chemical basis. All this, from another side demonstrates the composition of the material life on earth may come from space point of view.
2002年,科学家通过射电望远镜观测,首次在银河系中心地带的气尘云团中发现了脱氢乙二醇——一种参与构成生物体的糖分子。这团气云是正在形成中的恒星的一个组成部分。在这里探寻到糖分子,意味着这类构成生命体的化学物质有可能在出现于行星之前就存在于恒星周围了。在这个星际云层中包含着一百二十多种化学分子,其中少数是由8个或8个以上原子构成的复杂分子。糖分子能在这里被发现,已经说明有机分子可以在极度恶劣的环境中合成。糖分能够维持生命,当糖类物质和氢基酸等有机物随着天体撞击,大量来到地球并富集起来之后,就为生命的出现提供了化学基础。这一切,都从另一个侧面论证了地球生命的构成物质可能源自太空的观点。