As of the beginning of the new millennium, the NASA-German Helios 1 and 2 solar probes are the fastest spacecraft, reaching 252,800 km/h (158,000 mph) during their orbits of the Sun. The two spacecraft, which were launched in 1974 and 1976, were German probes especially designed to orbit the Sun. They were launched by Titan 3E rockets from Cape Canaveral, Florida, USA on December 10, 1974 and January 15, 1976.
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