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Explorer program: Quiz
  
  
  

Question 1: The Explorer program was later reestablished to catch up with the ________ after that nation's launch of Sputnik 1 on October 4, 1957.
RussiaSoviet UnionEast GermanyJoseph Stalin

Question 2: It began as a ________ proposal to place a scientific satellite into orbit during the International Geophysical Year, however, that proposal was rejected in favor of the U.S.
United States armed forcesUnited States Marine CorpsUnited States Army AfricaUnited States Army

Question 3: The Explorer program was taken over by ________, which continued to use the name for robotic spacecraft missions.
Space RaceNASASpace explorationHuman spaceflight

Question 4: (See: Sputnik crisis) ________ was launched January 31, 1958.
Wide-field Infrared Survey ExplorerExplorer programExplorer 1Swift Gamma-Ray Burst Mission

Question 5: These missions have also investigated air density, radio astronomy, geodesy, and ________.
Observational astronomyX-ray astronomyPhysical cosmologyGamma-ray astronomy

Question 6: satellite, it is known for discovering the ________.
Geomagnetic stormVan Allen radiation beltMagnetosphereAurora (astronomy)

Question 7: The Explorer program was the ________'s first successful attempt to launch an artificial satellite.
PhilippinesCanadaAlaskaUnited States

Question 8: Over the years, ________ has launched a series of "Explorer" spacecraft carrying a wide variety of scientific investigations.
Space RaceHuman spaceflightSpace explorationNASA
















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