SUMMARY: This week the European Space Agency celebrated the 20-year anniversary of the Giotto spacecraft's encounter with Comet Halley. This was ESA's first deep space mission, which launched on board an Ariane 1 rocket. Giotto flew for 8 months, traveling almost 150 million kilometres. It swept past the comet on March 13, 1986, getting as close as 596 km (370 miles), and delivered the best pictures ever seen of a comet's nucleus.
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