Tag Archives: galileo

this day in the yesteryear: Jupiter’s Io Observed by Spacecraft Galileo (2001)


Jupiter’s Io Observed by Spacecraft Galileo (2001)

Discovered by Galileo Galilei in 1610, Io is Jupiter’s closest and third largest moon. It played a significant role in the first measurement of the speed of light, calculated by 17th-century Danish astronomer Ole Rømer. The most geologically active of Jupiter’s moons, Io has 30 active volcanoes that are probably energized by the tidal effects of Jupiter’s enormous mass. In 2001, the unmanned spacecraft Galileo came within 110 miles (180 km) of Io. What did its images reveal about Io? More… Discuss

this day in the yesteryear: Planet Neptune Is Discovered (1846)


Planet Neptune Is Discovered (1846)

Neptune is notable for being the first planet to be discovered by way of mathematical prediction rather than standard observation. Galileo observed Neptune twice in the early 1600s, but he mistook the planet for a fixed star and is therefore not credited with its discovery. Centuries later, small changes in Uranus’s orbit led astronomers to seek out and discover the eighth and outermost planet of our solar system. Who predicted Neptune’s location in the 1840s within 1° of where it was found? More… Discuss

The Medici: Godfathers of the Re…: Power vs. Truth


http://www.pbs.org/empires/ – Giorgio Vasari writes a book to define the Renaissance; Galileo pursues his scientific studies with the support of the Medici family.