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1773 in science
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==Astronomy== [[File:Messier51 sRGB.jpg|120px|Whirlpool Galaxy|thumb|right]] * October 13 – [[France|French]] [[astronomer]] [[Charles Messier]] discovers the [[Whirlpool Galaxy]] ''(pictured)'', an [[Interacting galaxy|interacting]], [[grand design spiral galaxy]] located at a distance of approximately 23 million [[light-year]]s in the [[constellation]] [[Canes Venatici]]. * [[Joseph Louis Lagrange|Lagrange]] presents his work on the [[secular equation]] of the Moon to the [[Académie française]], introducing the idea of the potential of a body. He also publishes on the attraction of [[ellipsoid]]s.
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