翔x楓 發問時間: 科學天文與太空 · 6 年前

英文文章翻譯... 有挺多專有名詞

如提 以下的請大大幫忙

這一篇是有關於天文的文章

請不要用GOOGLE的翻譯...

那個我看過了 根本看不懂

感謝大大囉

The Boomerang Nebula (also called the Bow Tie Nebula or the Centaurus Bipolar Nebula, and designated PGC 3074547) is a young bipolar protoplanetary nebula of about 2 light-years across, located some 5,000 light-years away from Earth in the constellation of Centaurus.

Despite their name, protoplanetary nebulae have nothing to do with planets: they are clouds of dust and gas formed from material shed by an aging central star similar in mass to our Sun.

For such a star death is a long process. After billions of years, the hydrogen fuel that powers the star begins to run out. The star balloons to great size and becomes a red giant. Eventually, however, the star collapses back on itself. This increases the temperature at its core and most of the stars material is catapulted into space, enveloping itself in clouds of gas, but the core is not yet hot enough to make the gas itself glow on its own. Instead, the gas is merely reflecting the light from the star.

But as the star continues to evolve, it becomes hot enough to emit strong ultraviolet light. At that point it will have the power needed to make the gas glow, and will become a real full-fledged planetary nebula. But before the nebula begins to shine, fierce winds of material ejected from the star will continue to shape the surrounding gas into intricate patterns. Then the star cools down and all that is left after this process is the exposed, hot and dead core, known as a white dwarf.

A protoplanetary nebula is a relatively short-lived phenomenon, so finding one is a rare opportunity for astronomers to learn more about them and to observe the beginning of the formation of planetary nebulae (hence the name protoplanetary, or preplanetary nebulae).

The Boomerang Nebula is, with a temperature of −272 °C, only 1 °C warmer than absolute zero (the lowest limit for all temperatures). Even the −270 °C background radiation from the Big Bang is war

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  • 6 年前
    最佳解答

    雖然我不會翻譯 但我知道它是什麼

    這篇是在講[回力棒星雲](亦稱領結星雲)

    是在半人馬座的方向上,距離地球5,000光年的一個原行星雲。這個星雲的溫度經測量為1K(−272.15°C; −457.87°F),是自然界中已知溫度最低之處。回力棒星雲是由從一顆恆星的核心逸流出的氣體形成的,氣體向外流出的速度是164公里/秒,並且在進入太空之後很快速的膨脹。這種膨脹是造成它溫度下降的主要原因(絕熱膨脹)。

    在1998年,哈柏太空望遠鏡拍攝了回力棒星雲的詳細影像。它們認為這個星雲是正朝向行星狀星雲階段發展(演化)中的一顆恆星或恆星系。

    凱斯·泰勒(Keith Taylor)和麥克·史卡托(Mike Scarrot)在1980年使用在賽丁泉天文台的英澳望遠鏡觀察這個星雲之際,稱它為回力棒星雲。因為不能如同哈柏太空望遠鏡看得那麼清楚,天文學家看見狀似雲氣的瓣,有著輕微的不對稱,其灣曲處的弧度看似澳洲原住民使用的回力棒。高解析的哈柏影像則顯示出或許領結星雲會是比較好的名稱。

    在1995年,使用位於智利的15米瑞典ESO次微米波望遠鏡觀測,天文學家發現這是目前在宇宙中發現到的最冷的區域,溫度是−272 °C,只比絕對零度(溫度的最低極限溫度)溫暖了1K的溫度。即使是來自大霹靂的背景溫度-270°C,都比這兒更溫暖。這是目前唯一找到溫度比背景輻射還要低的物體,回力棒星雲的另一個專業的名稱為 PGC 3074547。

    在2013年,ALMA的電波干涉儀觀測發現這個星雲的其他特徵。這個星雲的雙瓣似乎被一團僅能在次毫米波的波長下觀測得到,更巨大的球體氣團包圍著;這個星雲的外緣似乎也逐漸變得溫暖中。

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  • 額度用完幫忙轉達意見者: Dragon ( 初學者 5 級 )

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    這題http://tw.knowledge.yahoo.com/question/question?qi...

    除了廣告沒有回答不知可願意指點,謝謝!?

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