Galileo wrote the 1613 letter to Benedetto Castelli, a mathematician at the University of Pisa in Italy. ... Most crucially, he reasoned that the heliocentric model of Earth orbiting the Sun, ...

Galileo, like no other scientist, personifies revolutionary historical change and the birth of modern science. Since Galileo’s time, science has not only made rapid progress, it has also become an ...

These "Medicean stars," as Galileo called them in the book's title page, were "unknown by anyone until this day," and they upended the current scientific view of Earth as the center of the universe.

In June 1609 Galileo Galilei heard about an optical instrument invented in Holland the year before, consisting of an arrangement of lenses that magnified images three to four times. Despite not having ...

Galileo was not the first scientist to observe the Moon through a telescope. The Englishman Thomas Harriot did so a few months earlier, in the summer of 1609, and Galileo followed suit, building ...

While Galileo didn't invent the telescope, he is the person most inextricably tied to its use and development. The field of optics had become so established, and the principles behind Lippershey's ...

A prized manuscript in the University of Michigan library that was believed to have been written by the famed Italian astronomer Galileo Galilei is a forgery, the university said.