Tag Archives: Ganymede

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

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THIS DAY IN THE YESTERYEAR: SATURN’S LARGEST MOON IS DISCOVERED (1655)


Saturn’s Largest Moon Is Discovered (1655)

Titan is Saturn’s largest moon and the second largest moon in the solar system. It was discovered by Dutch astronomer Christiaan Huygens in 1655 and remains the only natural satellite in the solar system known to have a significant atmosphere. The thick, opaque atmosphere obscures the surface, but some surface detail has been observed via the Hubble Space Telescope. When the Cassini-Huygens spacecraft arrived on Saturn in 2004, it revealed that Titan’s surface has what in common with EarthMore… Discuss

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