NASA’s New Horizons spacecraft flew past Pluto in 2015 and kept going, and in January 2019 it photographed a small icy world called Arrokoth four billion miles from the Sun, the most distant object ever visited, shaped like two snowballs gently stuck together since the solar system’s birth
At 5:33 UTC on 1 January 2019, NASA’s New Horizons spacecraft passed roughly 3,500 kilometres from a small…
