If astronomers could observe metallicity gradients in spiral galaxies billions of light-years away, we could see how steep the gradients were billions of years ago and thus how they change over time.
如果天文学家能够观测到十亿光年外的螺旋星云的金属丰度梯度，我们就可以知道亿万年之前的梯度有多大，因此也就可以知道它是如何随时间变化的。
By exploiting a lucky accident, astronomers have for the first time measured a key property of a spiral galaxy located more than nine billion light-years away.
通过一个偶然的机会，宇宙学家们第一次测量到了九十亿光年之外某个螺旋星系的一个关键性质。
Explanation Similar in size to other large, bright spiral galaxies, IC 342 is a mere 7 million light-years distant in the long-necked, northern constellation Camelopardalis.
IC 342和其他大型明亮的螺旋星系的大小相当，这个在北方天穹细长的鹿豹座中的星系离我们只有7百万光年。
One of the efforts people are making to try and reduce the amount of energy they use is to replace their old light bulbs with the new spiral compact fluorescent kind.
人类为了减少能源消耗所做的努力之一便是用新的螺旋紧凑型荧光灯来换下他们的旧灯泡。
It is located 3, 800 light-years away from Earth, inside the Orion spur — the same partial spiral arm of the Milky way where our solar system is located. The nebula is nearly 240 light-years across.
它跨度近240光年，位于猎户座旋臂里，离地球3,800光年远；而我们的太阳系也在银河系同样的旋臂中。
In fact, the nearby large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky way.
实际上，我们已经知道我们附近的仙女座大型螺旋星系大约距离有200万光年之遥，并且正在靠近银河系。
Perhaps the original spiral nebula, M51 is a large galaxy, over 60, 000 light-years across, with a readily apparent spiral structure.
也许旋涡星系m51原本是一个巨大的星系，直径超过6万光年，有显尔易见的旋涡结构。
The last picture is of a classic spiral galaxy called NGC 4145, located approximately 68 million light-years from Earth.
最后一张照片是名为ngc 4145的典型螺旋星系，距地球约6800万光年。
5：A four-way galactic pileup appearsimminent, but the bluish spiral, 40 million light-years away, is seven times asclose as the rest of Stephan's Quintet.
图5：这张精美的照片包含了四个形状各异的星系团，但呈蓝色螺旋状的星系团离地球有四千万光年的距离，为斯蒂芬五重星系的其他星系距离的七倍。
Nearly 40,000 light-years across, the nearby spiral is fittingly referred to as the Fireworks Galaxy.
烟花星系的螺旋近四万光年。
The galaxy, called NGC 1097 and located 50 million light-years away, is spiral-shaped like our Milky Way, with long, spindly arms of stars.
这个星系，被称为NGC1097，距我们5千万光年，和我们的银河系一样是个漩涡状星系，有着长长的、由群星组成的旋臂。
Menkhib and the California Nebula are about 1,800 light-years away from Earth and are located within the same spur of the Orion spiral arm of the Milky way galaxy as Earth.
Menkhib和加州星云大约距离地球1800光年，并在对银河系的地球银河系猎户座旋臂位于同一方向。
Menkhib and the California Nebula are about 1, 800 light-years away from Earth and are located within the same spur of the Orion spiral arm of the Milky Way galaxy as Earth.
Menkhib和加州星云大约距离地球1800光年，并在对银河系的地球银河系猎户座旋臂位于同一方向。
The terraces spiral upwards, catching the light at every angle, adding to the allure of this tiered tower, whilst leaving an impression of progressive transformation.
建筑形式像梯田一样螺旋向上，在建筑每个角度上都可以采光，增加了这个塔式建筑的魅力，同时给人留下一种渐变的印象。
Around the dark core of an optical vortex, the energy flow carried by the light beam is like a spiral staircase, flowing in a clockwise or counterclockwise direction.
绕着光涡旋的黑暗中心，光束携带的能量流就像螺旋梯，沿着顺时针或者逆时针方向流动。
The study shows that the stress in tooth middle is larger than that in tooth root with big spiral Angle and light load.
研究表明，大螺旋角或小载荷时，齿腰应力大于齿根应力。
A disc lit by a stroboscopic light rotates. The disc is covered with a series of pictures which move in a spiral from the outer edge to the centre.
一张由频闪观测仪旋转照亮的光盘，光盘本身被一系列图片覆盖，由外部边缘向中心螺旋式旋转。
Double-door entry has lovely spiral staircase with lots of natural light.
双门入口有可爱的螺旋楼梯和大量的自然光。
Also known as NGC 772, the island universe is over 100 thousand light-years across and sports a single prominent outer spiral arm in this detailed cosmic portrait.
这座宇宙岛的另一个编号是NGC 772，直径超过了10万光年，在下面这幅宇宙图中能清晰看到它只有一条外层螺旋臂。
Similar in size and grand design to our home galaxy (although without the central bar), spiral galaxy NGC 3370 lies about 100 million light-years away toward the constellation of the lion (Leo).
螺旋星系ngc 3370位于狮子座，距离我们约1亿光年，其大小和结构与我们银河系家园非常相似，只是没有中央旋棒。
The big, beautiful spiral galaxy is located just 10 million light-years away, behind a veil of foreground dust and stars in the high and far-off constellation of Cepheus.
这是一个很壮观而且漂亮的漩涡状星系，距离我们仅仅一千万年光年远，就在仙王座的位置。
The big, beautiful spiral galaxy is located just 10 million light-years away, behind a veil of foreground dust and stars in the high and far-off constellation of Cepheus.
这是一个很壮观而且漂亮的漩涡状星系，距离我们仅仅一千万年光年远，就在仙王座的位置。
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