The Long March-4 is a new version of the Long March family. It has successfully launched two FY-1 meteorological satellites into 901km solar synchronous orbit.
On August 25,1992,China suc-cessfully returned its 13th recover-able satellite from orbit after 16days’operation.The satellite is thefirst one of the second ge
In the early 1960s,with the ad-vent of the space era,it was quick-ly recognized that any object inspace was at risk due to the naturalmeteoroid environment.In t