 It's been a little over a decade since NASA's Galileo spacecraft plunged into Jupiter's atmosphere and went silent, but not before it changed the way we look at the solar system. I'm Amy Shearer, and this is a Vintage Space video. Launched in 1989, Galileo was the mission that taught us that asteroids can have moons of their own. It was the spacecraft that found strong evidence of a subsurface saltwater ocean on Europa, and evidence that Colisto was similarly a wet moon. It found evidence that tidal friction is responsible for Ganymede's molten core, a feature which gives the moon its own magnetic field. Galileo also gathered data that let scientists determine that the volcanoes on Io, which are caused by the expansion and contraction of that moon's surface, are hotter than any we have on Earth. Galileo also released a probe into Jupiter's atmosphere. The data this probe gathered as it fell on Jupiter's temperature and chemical composition helped scientists explain the raging storms that span the massive planet. For more on the Galileo mission and everything it taught us, check out the links below.