KNOWLEDGE CHECK

Select the best answer to the following question.

The cause of the U.S. Apollo 1 fire on January 27, 1967 was almost identical to the fire that killed Russian cosmonaut Bondarenko in 1961. What was it?
  1. A spark in the spacecraft's pure-oxygen system.
  2. A failure of the emergency escape hatch.
  3. The two-gas system failure to dilute oxygen with nitrogen during ground tests.
  4. The flammable nature of spacesuit construction.
Knowledge Check
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