For centuries, humanity believed that Earth was the center of the universe, a view championed by Aristotle and Ptolemy. But ...

To learn more about how Galileo's observations changed astronomy, check out Galileo: Sun-Centered System.

Witness Galileo's famous struggle to persuade church authorities of the truth behind his discoveries about the cosmos.

chronicles Galileo's clash with the Catholic Church following publication of his Dialogue on the Two Chief World Systems, a rhetorical masterpiece in support of the Copernican Sun-centered system.

chronicles Galileo's clash with the Catholic Church following publication of his Dialogue on the Two Chief World Systems, a rhetorical masterpiece in support of the Copernican Sun-centered system.

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 ...

1 in every 4 Americans -- 78 million people -- don't understand the Earth orbits the Sun, though new research finds that nearly half of Evangelicals believe that science and religion can work together ...

The heliocentric theory holds that Earth moves around the Sun at great speed, a controversial idea in Galileo's time. Even today, many people are still perplexed by the fact that we don't ...

The 1543 treatise detailing a Sun-centered cosmos captured Galileo’s imagination and ultimately contributed to his downfall.

To combat this, in his argument in favor of a sun-centered universe, Galileo came up with a thought experiment about relativity now known as Galileo’s Ship.