brightness variations

基本解释

Repetitive voltage fluctuations cause brightness variations in incandescent elements.
反复的电压波动引起白炽灯光度的变化。
Imaging the Earth from this distant perspective allows astronomers to connect overall variations in brightness at different wavelengths with planetary features.
从遥远的视角拍摄地球，使天文学家能够把不同波长上的整体明暗变化与行星的特征地貌联系在一起。
bbs.astron.ac.cn
In the numbers, they found minute periodic variations in brightness that they believe are caused by the changing phases of its gaseous giant planet, known as CoRoT-1b.
在诸多数据中，研究人员发现了在亮度上存在周期性的细微变化，他们认为这些变化是由于其巨大的气态行星不断变化的相位造成的，该行星叫做CoRoT-1b。
huzhangao.blog.163.com

The technology, which works by measuring brightness variations in your face, does not require special hardware.
ENGADGET
By analyzing measurements of 1207 RR Lyrae stars taken by the Catalina Mount Lemmon Telescope in Tucson, the team was able to observe dramatic brightness variations in these stars, taking place over periods as short as half a day.
FORBES: Astronomers Confirm Milky Way's Most Distant Stellar Stream
Variations in these brightness patterns might reveal the presence of a moon orbiting a planet.
MSN: News editor