Some comets are only visible with the help of a telescope

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While some comets are only visible with the help of a telescope, this comet, seen in 1965, was visible to the naked eye even during the day! What comet was it?
 
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marcus with the point!
 

Thread 'Predictions for the Nobel Prize in Physics 2025'

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I believe it was the summer of 2001 that I made a trip to Peru for my work. I was a private contractor doing automation engineering and programming for various companies, including Frito Lay. Frito had purchased a snack food plant near Lima, Peru, and sent me down to oversee the upgrades to the systems and the startup. Peru was still suffering the ills of a recent civil war and I knew it was dicey, but the money was too good to pass up. It was a long trip to Lima; about 14 hours of airtime...
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