NASA is yet to study 84% of Moon rocks brought 45 years ago
In six Moon landing missions, astronauts brought back 2,200 rock samples weighing about 382 kg, out of which 84% still remain untouched, NASA curator Ryan Zeigler has revealed. Of the 16%, one-third have been put on public display, while the rest were used for research. Humans have not been to the Moon since the last Apollo mission in December 1972.