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The white dot in the photos is a background star. 相中的白点是一颗背景星。
Gravitational microlensing happens when a foreground star amplifies the light of a background star that momentarily aligns with it. 当两个恒星迅速“结盟”时，位于前方的恒星会强化作为背景的另一颗恒星发出的光线，此时就发生了因重力作用而形成的引力透镜现象（译者注：巨大质量的天体导致光线在其附近弯曲）。
The mosaic digitally stitches together fifteen carefully exposed high resolution images of a bright, gibbous Moon and a representative background star field. 这张数字影像是从15张精细曝光的高清晰明亮凸月影像和典型的背景星场影像结合而成的。
The dark nebulae stand out because they block out background stars. 黑暗星云之所以突出是因为它们遮挡了背景的恒星。
The two discovery images of S/2002 J1 showing the motion of the satellite relative to background stars and galaxies. 两张S/2002J1的图片，显示出该卫星相对于恒星和星系背景在移动。
Spots and blemishes on the image are background stars and camera streaks caused by charged particles. 图像上的斑污点是天空背景里的星星及带电粒子造成的相机条纹。
Background stars are also visible as the otherwise overwhelming sunlight is blocked by the coronograph's occulting disk. 在影像中还能看到背景恒星，另外强烈的太阳光被日冕观测仪的掩盘给遮挡了。
You can observe the moon's orbital motion from one night to the next by watching the moon's location with respect to background stars. 通过观察对比月亮在某一个晚上和在第二个晚上与参照星座的相对位置，你能看到月亮的轨道运动。
Background stars can be seen peeking through the evaporating tendrils of gas, while the turbulent base is pockmarked with stars reddened by dust. 透过如蒸腾的卷须般的气体区域，背景里的恒星依然可见，而同时，这个像紊流一样的基体也镶嵌着因尘埃的影响而发红的恒星。
Here, a high concentration of dust and molecular gas absorb practically all the visible light emitted from background stars. 在这个分子云中，高密度的尘埃和分子云气几乎完全挡住了背景恒星所发出的可见光。
Aligning each exposure with the stars shows the comet as a streak, slowly moving against the background stars and galaxy. 连接每一张曝光影像就能显示出彗星形成一条轨迹，慢慢地朝远离星系的方向运行。
For a while, the darkling star disappeared behind thick clouds. 隐约出现的星星暂时消失在厚厚的云层後面了。
While waiting for the Moon to rise last month in Thurso, Scotland, amateur astrophotographer Stewart Watt took a three minute exposure of the background stars. 上个月，在等待月亮升起于苏格兰瑟索之际，业余天文摄影师斯图尔特瓦特花了3分钟曝光了背景星辰。
He has an urge to become a cinema star. 他渴望当一名电影明星。
In the image dust is red hot gas is green and white is where gas and dust intermingle. Foreground and background stars appear scattered through the image. 在该图像中，尘埃为红色，热气体为绿色，气体与尘埃混合处为白色，前景和背景中的恒星遍布整个图像。
She is crazed about the film star. 她对那位影星着迷。
All but the morning star have disappeared. 除掉金星以外其他的星星全都消失了。
The children mobbed the baseball star. 孩子们欢呼着朝那棒球明星围上去。
The cast of the play included a international star. 这个剧的演员名单中有一位国际明星。
The coach saved his star player for a trump card. 教练保留他的明星选手，作为他的王牌。