with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated observations over several nights and realized they were ...

By the 17th century, famed engineer and astronomer Galileo Galilei refined Copernicus' heliocentric model using observations made with telescopes he built himself. However, it was not until Kepler ...

In his 2006 book, Galileo’s Instruments of Credit: Telescopes, Images ... starting with Galileo’s observations of the four largest moons of Jupiter in January, 1610. It is a discovery that ...

Galileo's telescope opened the skies to observation; Hawking's equations made the invisible visible, from black holes to the Big Bang. It's staggering to think about what these two men accomplished.