Webster's Online Dictionary
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Specialty Expressions: EXPLORER 1

ExpressionsDomainDefinition
Explorer 1Aerospace1: First satellite launched by the US, around midnight of January 31, 1958. Carrying Geiger counters, Explorer 1 and the similar Explorer 3 (launched two months later) discovered the existence of a belt of magnetically trapped energetic particles around Earth. (references)
  2: The first US artificial satellite, launched 31 January 1958 by a 4-stage modified military rocket. Provided the earliest observations of the Earth's radiation belt. (references)

Source: compiled by the editor from various references; see credits.

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