Galileo se născuse la 15 februarie 1564, la Pisa, dar când a împlinit 8 ani s-a mutat cu familia la Florenţa. S-a dedicat studiului matematicii şi fizicii, iar în 1586 a construit o „balanţă hidrostatică” pentru determinarea greutăţii specifice a unui corp. În 1589 a fost numit la conducerea catedrei de Matematică a Universităţii din Pisa, perioadă în care a studiat căderea corpurilor, publicând lucrarea „De Motu” („Despre mişcare”).
În 1593, lui Galilei i s-a oferit catedra de Matematică, Geometrie şi Astronomie a Universităţii din Padova, iar în 1609 a publicat lucrarea „Nuova astronomia” („Astronomia nouă”), care conţinea primele două legi ale mişcării planetelor. După 1610, Galilei a început să susțină teoria lui Copernic, că Soarele, şi nu Pământul, se află în centrul Universului, fiind judecat în 1633 de Inchiziție, ameninţat cu tortura şi umilit.
Se spune că, silit să se dezică de această teorie, Galileo ar fi pronunţat celebrele cuvinte ”Eppur si muove” (”Şi totuşi se mişcă”). Galileo, care şi-a petrecut restul vieţii în arest la domiciliu, a murit la 8 ianuarie 1642, la 78 de ani.
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