Who was Galileo? -- Galileo's early years -- Change of direction -- Galileo's fame grows -- Problems at Pisa -- Life in Padua -- Marvelous invention -- Telescopic discoveries -- Life in Florence -- Church and science -- Under suspicion -- Warning -- Comet debate -- Galileo visits the Pope -- Dialogo -- Trouble at the Vatican -- Galileo on trial -- Prisoner -- Galileo's last days -- Galileo's legacy.