Excitement ahead of distant Nasa flyby

History will be made on Tuesday when Nasa's New Horizons probe sweeps past the icy world known as Ultima Thule. Occurring some 6.5 billion km (4 billion miles) from Earth, the flyby will set a new record for the most distant ever exploration of a Solar System object by a spacecraft. New Horizons will gather a swathe of images and other data over the course of just a few hours leading up to and beyond the closest approach.
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