星体的亮度大约分三个星等。
有几年它的亮度一度达到了现在的太阳亮度的一万倍左右。
For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun.
人们很容易降低窗户的亮度以保持凉爽。
People could simply make the windows less bright to stay cool.
吴说，这将类似于我们获得月亮光照的方式，但他预测，人造月亮的亮度将是真实月亮的8倍。
Wu said it would be similar to how we get moonlight, but he predicted that the man-made moon would have eight times the brightness of the real one.
最好的信号不仅取决于它的亮度，还取决于它与背景的对比度。
The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.
有些见证者把这个火球的亮度比作太阳。
Some witnesses compared the fireball's brightness to the sun.
天文学家用星等和光度来描述恒星的亮度。
Astronomers describe star brightness in terms of magnitude and luminosity.
暗框使画的亮度更明显。
Accentuate the dark frame accentuates the brightness of the picture.
当一个类星体爆发时，它的亮度可以超越一千个常规的星系。
When one is firing, its brightness can exceed a thousand normal galaxies.
同时要检查看看投影仪的亮度是否比房间的亮度强。
Also, check to see if the projector is bright enough to overpower the room's lighting.
用手指在手机屏幕左侧上下滑动可以改变屏幕的亮度。
When you slide your finger down the left side of the device screen, the brightness changes.
作为对比，木星的亮度也只有我们的太阳的十亿分之一。
By comparison, Jupiter is one-billionth the brightness of our sun.
进入电脑显示设置，做些必要的调整以配合房间的亮度。
Go to your computer display Settings and make the necessary adjustments to match the brightness of the room.
图象专家曾猜测，幽灵照片是由大火的亮度造成的错觉。
Photographic experts have suggested that the 'ghost' image was a trick of the light caused by the fire.
孔径越大，它收集的光越多，成像的亮度和清晰度就越好。
The larger the aperture, the more light it collects and the brighter and clearer the image will be.
数码相机无法应付闪电主体的亮度，它变成了模糊的粗线条。
The digital camera was unable to cope with the brightness of the main streak and turned it into a thick blurry line.
恒星的表面温度部分取决于它的质量，并影响它的亮度和颜色。
The surface temperature of a star depends in part on its mass and affects its brightness and color.
他们在灯的电极之间利用等离子产生的亮度，就能产生强烈的蓝光。
They get their intense, blue-tinged light direct from the tiny plasma glowing brightly between the lamp’s electrodes.
艾里斑的亮度(点光源恒星的图像亮度)正比于孔径尺寸的四次方。
Airy disk brilliance (the brightness of a point-source stellar image) is proportional to the fourth power of aperture.
尽管还不知道是否仅仅简单地改变周围灯光的亮度也会有同样的作用。
It was not known, though, whether simply altering ambient light intensity might have similar effects.
星星(点光源)的亮度只是望远镜孔径的函数-孔径越大，图像越亮。
The brightness of stars (point sources) is only a function of telescope aperture-the larger the aperture, the brighter the images.
退一步说，一盏白炽灯能产生的亮度与其照明寿命之间的关系很复杂。
The relationship between the amount of light an incandescent bulb can produce and how long it will last is complicated, to say the least.
由于木星其中一条棕色云带隐藏起来了，所以木星的亮度会比平常亮4%。
Jupiter is also brighter than usual by about 4 percent because one of its brown cloud belts is hidden.
拍摄对象的亮度应该与背景相同，或比背景更亮，否则图片的亮度会失衡。
The subject should be equal to or brighter than the background, otherwise the image will not be balanced. (Ignacio Palacios/LPI)
开普勒望远镜的工作原理是监测其视野内成千上万个恒星的亮度的微小变化。
Kepler works by monitoring the thousands of stars in its field of view for tiny changes in brightness.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
这个三个星团因为他们密集的亮度的大质量恒星很容易被多目标光谱仪观察到。
These three clusters are easily seen as tight concentrations of bright, massive stars in the NICMOS image.
这个三个星团因为他们密集的亮度的大质量恒星很容易被多目标光谱仪观察到。
Thesethree clusters are easily seen as tight concentrations of bright, massive stars in the NICMOS image.
这个出乎意料的发现是因为发现超新星的亮度(表示距离)和以前的理论不相符。
That unexpected finding was the result of studies of supernovas whose apparent brightness (and therefore distance) did not match the previous theory.
这个出乎意料的发现是因为发现超新星的亮度(表示距离)和以前的理论不相符。
That unexpected finding was the result of studies of supernovas whose apparent brightness (and therefore distance) did not match the previous theory.
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