New Horizons science team members give personal accounts of their work during the Voyager Neptune encounter and their new assignments on the Pluto mission.
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Live coverage: New Horizons returns first close-up image
NASA’s New Horizons spacecraft made a historic New Year’s encounter with an object nicknamed Ultima Thule in the Kuiper Belt a billion miles beyond Pluto. The probe passed around 3,500 kilometres from the mysterious object at 0533 GMT on New Year’s Day, making it the most distant Solar System body ever explored up close.