只是一个小townhouse - sized本周指定TD 54小行星2010年由美国在海拔略读仅仅在几千英里以上我们的地球静止轨道通信卫星。
Just this week a small townhouse-sized asteroid designated 2010 TD54 skimmed by us at an altitude just a few thousand miles above our geostationary communication satellites.
由于立方体卫星体积小、重量轻，将它们送入地球轨道的成本比传统通信或GPS卫星要低得多。
Because they're so small and light, it costs much less to get a CubeSat into Earth's orbit than a traditional communications or GPS satellite.
由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。
Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
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