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1910 - Halley's Comet passes 29th recorded perihelion at 87.9 million km
1940 - 1st electron microscope demonstrated (RCA), Philadelphia, Pa
1962 - NASA civilian pilot Neil A Armstrong takes X-15 to 63,250 m
1971 - Barbra Streisand records "We've Only Just Begun"
1993 - Uranus passes Neptune (once every 171 years)
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