Italian astronomer Galileo Galilei made a number of inventions and discoveries that remain important to astronomy and science in general today.

The sighting of Jupiter's moons by Galileo Galilei resonates through science and history. Using a handmade telescope in January 1610, Galileo confirmed the Copernican theory that the planets moved ...

Galileo Galilei, though famous for his scientific achievements in astronomy, mathematics, and physics, and infamous for his controversy with the church was, in fact, a devout Christian who saw not ...

Galileo Galilei is going from heretic to hero. The Vatican is recasting the most famous victim of its Inquisition as a man of faith, just in time for the 400th anniversary of Galileo's telescope ...

Galileo Galilei famously stood trial for his insistence—based on astronomical observations through his telescopes—that the Copernican model of the Solar System was correct. The Earth revolved ...

Jupiter is the largest planet in our solar system with 80 moons. Galileo was the first to discover the moons of Jupiter on this day in history, Jan. 7, 1610.

Galileo’s telescope anchors the exhibit “Galileo, the Medici and the Age of Astronomy,” which is at the Franklin Institute in Philadelphia until September 7, 2009.