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 作者:荣扰缏     |      日期:2019-03-09 08:06:10
AWOL satellite A European communications satellite called Astra 5A that failed on 16 January has become a threat to other spacecraft in geosynchronous orbit. Its operator, Luxembourg-based SES Astra, is tracking the craft and notifying operators of nearby satellites that could be in harm’s way. Surge for tidal energy Five designs were shortlisted on Tuesday for the world’s largest renewable energy project,