The space surveillance network has been transmitting observations.
空间监视网络一直在传输观测结果。
CNN 10 学生英语 2017年2月合集
They're currently building what they call a " space fence" , which is just a radar-based space surveillance system that will allow the Air Force to better track space debris and artificial satellites.
Space surveillance is the study and monitoring of satellites orbiting the earth. It involves the detection, tracking, cataloging and identification of artificial objects, i.e. active/inactive satellites, spent rocket bodies, or fragmentation debris.