Table of Contents:
  • Introduction (8:22; 5:23)
  • Sputnik 1 (1:00)
  • Doppler effect : information derived from it (Sputnik-- ) (3:10)
  • Sputnik 3 (3:51)
  • Laika's heart (1:02)
  • Explorer 1, telemetering signals (3:59)
  • "Explorer 2 goes a ride" (1 :44)
  • Vanguard (third attempt) (5:38)
  • Modulation from Explorer 1 (:39)
  • Explorer 3 (2:11)
  • Explorer 4 (2: 40).