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Text File  |  1992-09-01  |  294b  |  9 lines
  1. An early series of US Earth-orbiting
  2. satellites and their associated rocket
  3. launcher. Vanguard 1 was the second US
  4. satellite, launched 17 Mar 1958 by the
  5. three-stage Vanguard rocket. Tracking of its
  6. orbit revealed that Earth is slightly
  7. pear-shaped. The series ended Sept 1959 with
  8. Vanguard 3.
  9.