In the context of spaceflight, a satellite is any object which has been placed into orbit by human endeavor. They are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon. The United States Space Surveillance Network (SSN) has been tracking space objects since 1957 when the Soviets opened the space age with the launch of Sputnik I. Since then, the SSN has tracked more than 26,000 space objects orbiting Earth. The SSN currently tracks more than 8,000 ...
Chinese Vice Premier Hui Liangyu on Saturday sent a congratulatory letter to the team that put two small disaster-monitoring satellites into orbit. "My heartfelt thanks and profound respect go to all the researchers, scientists and staff who ... ...
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