Galileo Galilei identified four of Jupiter's orbiting moons, examined Saturn, observed the varying phases of Venus, and scrutinized sunspots on the surface of the sun.

July 25 has been a date marked by remarkable events that have shaped history.One of the most profound events occurred on July ...

In a mission that changed our understanding of gas giants, NASA’s Galileo spacecraft made history not just in orbit but also ...

Two new moons have been discovered orbiting Jupiter, bringing the total number of natural satellites orbiting the gas giant ...

Moon drawings from Siderius Nuncivs by Galileo Galilei, 1610. At the time the moon was believed to be perfectly smooth, like the Sun. Galileo differentiated great and ancient spots (macula magna ...

Galileo called them sunspots, a term we still use today. This argued against the belief that the sun was a perfect, unchanging orb in the sky.

It begins at the end, as it were. We see Galileo looking back over his life. He’s nearly blind from looking too long at the sun. Each of the ten scenes takes a step backward in time.

“Galileo Galilei” is based on the life of the 16th-17th century astronomer, physicist and engineer, whose work proved Copernicus’ theory that the universe is heliocentric — that the sun ...

The Vatican announced today it will publish secret records of the 17th century trial of the astronomer Galileo Galilei, who was charged with heresy for claiming that the Earth revolved around the sun.

A physicist and mathematician, Galileo helped establish the scientific method, which is based on observation and experiment.</p> <p>In 1609, he demonstrated a simple contraption to the Venetian ...