这颗卫星利用地面对激光的反射，让研究人员以极高的精度测量地形。
The satellite bounces laser light off the ground, allowing researchers to measure the terrain with extraordinary precision.
这项估算的依据是用地震技术测量记录到的第一批地震波，这种方法在地震超过8.5级时会造成估算不足。
This estimation relied on seismological techniques measuring the first seismic waves recorded, a method that lends itself to underestimation when a quake exceeds a magnitude of 8.5.
但测量行星的质量，天文学家通常还需要使用地球上最大的天文望远镜，来测算径向速度的耗时。
But to get the planet's mass, astronomers normally need to follow up with time-consuming radial velocity observations at some of the planet's biggest telescopes.
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