But eventually, Galileo concluded that the moons’ orbits around Jupiter must be inclined to our line of sight, and drew the moons as they actually appear in the sky. Galileo was always drawing ...

This line engraving of Galileo depicts the astronomer alongside a drawing that shows Earth’s orbit around the Sun, as well as the Moon’s orbit around Earth. Line engraving by Boutrois ...

Galileo Moon Drawings. If the end of Galileo's life bore the poignant stamp of art, so did its beginning. To this day, on the facade of a Florentine palace, a plaque commissioned by Galileo's disciple ...

On this date, Jan. 7, 1610, astronomer Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter ...

The bottom half, supposedly written months later, contains a series of "doodles" that depict Jupiter's moons—once thought to be original notes from Galileo's observations in January 1610.

Galileo was the first person to observe the rings of Saturn. He spent hour after hour on painstaking drawings of the Moon through its phases, observed Venus and Mars, ...

More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA's ...

On Jan. 7, 1610, Galileo discovered four moons revolving around Jupiter — a discovery that would change his life forever. These four moons are Jupiter’s largest satellites — lo, Europa ...

On November 5, 2002, NASA's old Galileo spacecraft was almost out of fuel. But the Jupiter mission still had some science to do. ‘On This Day in Space’ Video Series on Space.com Galileo flew ...