The sun was considerably less bright back then.
那时的太阳要暗得多。
In fact, they are simply less bright.
实际上，它们只是不那么明亮而已。
A third of a century later, however, the visit looks less bright than it did at the time.
然而三分之一世纪之后再回顾这次访华之旅，似乎却已光环不再。
If the stars seem a little less bright and the skies less clear later this year, then part of the reason will be the Gobi gunk that has been blown into the Earth's atmosphere over the past few days.
今年晚些时候，如果你看到天上的星星不那么明亮，天空不那么清晰，一部分的原因就是过去几天从戈壁沙漠吹到地球大气层的沙尘。
Near the horizon it is always less bright, while in the region immediately around the sun it is more or less yellow.
靠近天边，色彩往往较暗淡，太阳周围的地方则略呈黄色。
NGC 1427a is an example of a dwarf irregular galaxy, a type of galaxy that is significantly less bright than regular galaxies and characterised by a peculiar shape.
NGC 1427a是个典型的矮星系、不规则星系，它们的外形不规则，并且光度比规则星系(涡旋星系、椭圆星系)小。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop. Others appeared brighter at times and less bright at others.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动，而其他行星看上去有时亮些，有时又不怎么亮。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop. Others appeared brighter at times and less bright at others.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动，而其他行星看上去有时亮些，有时又不怎么亮。
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