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Masters of orbital trajectories Navigating on Earth requires a good knowledge of your surroundings and of where you want to go; explorers can also use a compass or GPS to guide them. Travelling in space is far trickier, as Euronews 'Space' magazine discovered on a visit to ESOC in Germany, the ESA establishment that controls all the Agency's spacecraft in orbit.Navigation in space is complicated because it is three dimensional, with extremely complex craft often travelling at great speeds towards targets that are constantly moving. There is the additional challenge of communicating over great distances.
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