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| | Chronology of Sputnik/Vanguard/Explorer Events 1957-58 (Site not responding. Last check: 2007-10-08) |
 | | November 3 USSR: Sputnik 2 (508.3 kg), with dog Laika as passenger, launched |
 | | May 15 USSR: Sputnik 3 (1,327 kg) orbits, carrying large array of scientific instruments, but tape recorder fails, so it can't map Van Allen belts |
 | | Source: James J. Harford, "Korolev's Triple Play: Sputniks 1, 2, and 3," adapted from James J. Harford, Korolev: How One Man Masterminded the Soviet Drive to Beat America to the Moon (John Wiley: New York, 1997). |
| www.hq.nasa.gov /office/pao/History/sputnik/chronology.html (221 words) |
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