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Pioneer Program
2009-07-06 12:24:05

The Pioneer Program is a series of American unmanned space missions designed for planetary exploration. The program included a number of missions, but the most well-known missions were Pioneer 10 and Pioneer 11. Both Pioneer 10 and 11 explored the outer planets and left our solar system. Both probes carry a gold plaque, depicting a man and a woman and information about the origin of the probes...

Word of the Day
tessitura
  • The prevailing range of a vocal or instrumental part, within which most of the tones lie.
This word is Italian in origin and comes from the Latin 'textura,' web, structure.