Scientists studying the distant object known as Ultima Thule are revising ideas about its shape after examining the latest images downlinked to Earth. The pictures, taken by the New Horizons probe on 1 January, show the apparently bulbous body to be quite flat. This interpretation is evident from the data acquired by the Nasa spacecraft when it looked back at icy Ultima Thule as it zoomed past at 50,000km/h.
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