他立即运行中心的轨道预测软件，计算小行星离地最近距离，然后打电话警告切斯利一场即将发生的小行星撞地球。
He ran it through MPC's orbit-projection software, which can tell how close an asteroid will come to Earth, and phoned Chesley to alert him of an impending collision.
这颗行星距离地球大概153光年，质量比木星稍轻，但是它轻快敏捷的轨道距离中心恒星却比木星的近100倍。
The planet is about 153 light-years from Earth, and weighs a bit less than Jupiter. But its zippy orbit is a hundred times closer to its star than Jupiter's is.
螺旋星系中的轨道速度并不会随著离开星系中心的距离增加而不停降低，它会平缓下来成为一固定值。
Orbital velocities in spiral galaxies, instead of declining with increasing distance from the galactic center, flatten out to a constant value, as predicted by MOND.
一颗重达100公斤220磅的实验卫星将于7.30号从位于Goheung市距离韩国首府汉城475公里的南韩Naro宇宙空间中心发射，进入地球低轨道。
An experimental satellite weighing 100 kilograms (220 pounds) will be launched into a low earth orbit on July 30 from the Naro Space Centre in Goheung, 475 kilometres (300 miles) south of Seoul.
一颗重达100公斤220磅的实验卫星将于7.30号从位于Goheung市距离韩国首府汉城475公里的南韩Naro宇宙空间中心发射，进入地球低轨道。
An experimental satellite weighing 100 kilograms (220 pounds) will be launched into a low earth orbit on July 30 from the Naro Space Centre in Goheung, 475 kilometres (300 miles) south of Seoul.
应用推荐