Galilei, Galileo (1564-1642)
The Galileo Project is a source of information on the life and work of Galileo Galilei
Newton, Isaac (1634 - 1727)
Newton was an English physicist and mathematician and the greatest scientist of his era
Sagan, Carl (1934 - 1996)
Carl Sagan was the David Duncan Professor of Astronomy and Space Sciences and Director of the Laboratory for Planetary Studies at Cornell University