Echo American passive communications satellite. The Echo satellites were NASA's first experimental communications satellite project. |
Westford Needles American passive communications satellite. In an attempt to lay a radio-reflective ring around the world, small metal dipole needles were allowed to sublimate out of a matrix. Experimental, communication, passice satellite for MIT Lincoln Laboratory, USA. Launched 1961-1963. |
Echo 2 American passive communications satellite. Passive communications satellite; balloon; 1st joint US/USSR space mission. |