An analysis of the Hayabusa-2 sample of material returned to Earth from the carbon-rich, diamond-shaped, near-Earth asteroid Ryugu shows that the material is very dark, reflecting only 2% of light, porous and similar to clay, contains carbonates (a fraction of them enriched in iron) as well as compounds rich in nitrogen and hydrogen. A carbonate-rich grain in the sample of material from the near-Earth asteroid Ryugu. Image credit: Pilorget et al.,...