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Joel Marks Topics
GlobalDemocracySecurity > Vision > Galactic > Contributors > Joel Marks > SpaceThreats
Joel Marks
Comet Day, Anyone? by Joel Marks

On this day 245 years ago – July 1, 1770 – humanity had its closest known encounter with extinction (with the possible exception of the Cuban Missile Crisis).

Two weeks before that date the French astronomer Charles Messier had discovered a faint comet in the constellation Sagittarius, which thereafter rapidly brightened and began moving swiftly across the sky. At its peak it was naked-eye, and its coma, according to various observers, the apparent size of from 5 to 16 full moons across. Lexell’s Comet, so named after another ...