但与每天24小时盯着地球同一个区域的气象卫星不同，一般情况下泰拉和阿卡只能各获取一张有关墨西哥湾的白天视图。
But unlike weather satellites that look at the same region on Earth 24 hours a day, Terra and Aqua generally only get one daylight view each of the Gulf of Mexico.
月球引起了每个白天的潮汐，同时也给自己带来了副作用——它正沿着螺旋状轨迹慢慢的远离地球。这个可以用岩石和化石上的线索加以证明的现象，昭示了这颗卫星最初和最终的命运。
The moon is slowly spiraling away from Earth as it drives day-stretching tides, a phenomenon recorded in rocks and fossils that provides clues to the satellite's origin and ultimate fate.
这三颗卫星均为光学卫星，它们可以在白天和良好天气下抓拍图像。
The three are all optical satellites, which can capture images in daylight and in clear weather.
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