What challenges did scientists face during the Hayabusa2 mission to asteroid Ryugu?

The Hayabusa2 mission faced greater landing difficulties than anticipated due to Ryugu's extremely rocky surface. Despite these challenges, the mission successfully completed two sample collection operations - the first gathering material from the asteroid's surface and the second retrieving samples from underground. These complex landings required precise navigation and careful planning by JAXA scientists, but ultimately resulted in collecting more sample material than expected. This successful sampling strategy provided researchers with valuable materials to study the composition of the asteroid and potentially unlock secrets about our solar system's origins.