The Hayabusa-2 spacecraft was launched by Japan’s space group (Jaxa) in 2014.
Three-and-half years after it reached a end – a asteroid famous as 162173 Ryugu.
The 900m (2,950ft) far-reaching space stone is suspicion to be left over from a early days of a Solar System and could yield clues about a start and expansion of Earth.
The booster has given deployed rovers to try a asteroid and will also land on a aspect of Ryugu itself to collect samples, before holding off again.
BBC Click’s Spencer Kelly meets a group behind a plan to find out more.