Galileo's observations of the night sky in the early 1600s confirmed a new model of the universe, in which the Earth orbited the sun—and not the other way around, as his contemporaries believed. But ...

The Renaissance physicist, mathematician, philosopher and astronomer Galileo Galilei is perhaps best known for his work on gravity, relative motion and the discovery of numerous astronomical objects ...

Instruments of revolution can appear deceivingly simple. With a bit of wood, copper wire and paper, Galileo fashioned a telescope that opened the skies for discovery. The telescope had a magnifying ...

Exactly 400 years ago today, Galileo unleashed what may be his most lasting contribution to science: the telescope. As both the International Year of Astronomy and Google’s home page both commemorate, ...

PHILADELPHIAPHILADELPHIA — Though it looks like a cardboard tube that got left out in the rain, it’s a priceless instrument whose owner changed the world. The mottled brown cylinder on display at The ...

Despite the summer heat, the Senate of Venice assembled on this day in 1609 to view a remarkable scientific instrument. It was built by the well-known astronomer and philosopher from Pisa, Galileo ...