"Galileo" required a triple gravity assist – from Venus, Earth, and then Earth again – to propel it from the inner part of the solar system to Jupiter in the outer system. The trajectory made it possible to also observe asteroids 951 Gaspra and 243 Ida. "Galileo" had two major components: an orbiter which examined Jupiter and its four largest moons for eight years, and a probe which descended into the Jovian atmosphere to take direct samplings before being destroyed by the gas giant's heat and pressure.