polar orbit

基本解释

Since its launch Dec. 14, 2009, the Wide-Field Infrared Survey Explorer has been circling the Earth in a polar orbit and snapping images every 11 seconds.
自2009年12月14日发射升空以来，广角红外线探测望远镜开始环绕绕地球极地轨道并每11秒抓拍一张照片。
TerraSAR-X is an Earth-observation satellite that travels around the planet in a polar orbit, and records X-band radar data about the planet using its active antenna.
TerraSAR-X是一颗地球观测卫星，环绕地球极地轨道飞行同时使用自身的有源天线记录X波段的雷达数据。
Upon arrival on July 4, 2016, Juno will slingshot itself into an unprecedented polar orbit that will bring it to within 3, 100 miles of the planet’s massive cloud tops.
“朱诺”号探测器将于2016年7月4日到达木星。届时，它会自动弹射到新的极地轨道上，从而进入跨度达3100英里的大规模云层带。

It is in a so-called polar orbit: each turn around Mars takes it over the north and south poles while the planet revolves beneath it.
ECONOMIST: A drought on Mars