... The International Cometary Explorer ( ICE ) spacecraft has now had a close encounter of the best kind (the real kind) with Comet Giacobini-Zinner and has returned a host of useful scientific information. ... While Halley's Comet is too close to the Sun for observation, we can turn our attention to the Voyager 2 spacecraft's closest encounter with the planet Uranus. ... Planet A spacecraft (Japan) has its closest fly-by of Halley's Comet; distance = 100,000 to 200,000 km (60,000 to 120,000 mi) . ...