"Project West Ford (also known as Westford Needles and Project Needles) was a test carried out by Massachusetts Institute of Technology's Lincoln Laboratory on behalf of the United States military in 1961 and 1963 to create a ring of 3.5×108 copper dipole antennas (1.78cm long and 25.4μm (1961) and 17.8μm (1963) diameter needles) in orbit which would allow global radio communication."
-- Wikipedia
[I figure the individual needles weighed about 40 micrograms each. If you were wondering.]
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