Lost notes reveal Galileo closely studied the ancient Greek astronomer Ptolemy, offering fresh insight into his early scientific thinking.

At SLAC National Accelerator Laboratory in Menlo Park on Wednesday morning, researchers focused a powerful X-ray machine on pages of parchment from a medieval desert monastery, looking to reveal ...

A historian has identified Galileo's handwritten notes in a rare 16th-century copy of one of history’s most influential astronomy books. The discovery includes marginal comments and a handwritten ...