天体的运动轨迹为圆锥曲线（椭圆、抛物线和双曲线），其中椭圆曲线轨道为开普勒轨道，逃逸抛物线和双曲线轨道为非开普勒轨道。非开普勒轨道可以分为单心引力场和多心引力场。
随着一项简单的任务，寻找其他“地球”，开普勒轨道天文台启动。
The Kepler orbiting observatory was launched with a simple mission - to find other Earths.
随着开普勒轨道天文台的继续扫描，数据与分析(例如Traub文件)将会继续变得更加准确。
As Kepler continues to scan, data - and analyses such as Traub's paper - will continue to become more accurate.
这项分析暗示，或许有比从前预想的更多的潜在“地球”在进行着轨道运动，这一原则将会拓展到还没被开普勒轨道天文台扫描到的地区。
Traub's analysis hints that there may be even more potential 'Earths' orbiting them than previously thought - and that this' principle 'would extend to stars not yet scanned by Kepler.
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