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Explorer 1 was the first satellite launched by the United States when it was sent into space on January 31, 1958. The primary science instrument on Explorer 1 was a cosmic ray detector designed to measure the radiation environment in Earth orbit.
Word of the Day
- A handkerchief.
- In general, any miraculous portrait of Christ.
The word 'sudarium' comes from a Latin word meaning 'a handkerchief'.