NASAβs 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 systemβs birth
New Horizons found Arrokoth four billion miles from the Sun, revealing a flattened contact binary whose intact lobes preserve evidence of a gentle early merger. The post NASAβs New Horizons spacecraft...