Tiny fragments of rock brought back from an asteroid in near-Earth solar orbit are so old, they predate the Solar System.
asteroid Ryugu
As identified by previous research, these presolar grains reveal Ryugu is very similar to a class of meteorites known as Ivuna-type carbonaceous chondrites. "The samples returned from asteroid Ryugu by the Hayabusa2 spacecraft contain presolar stardust grains. Their abundances and compositions are similar to presolar material found in CI chondrites.
The team compared these grains with grains found in meteorites, and found that Ryugu's makeup is very similar to that of CI chondrites. These are a rare subtype of carbonaceous chondrites, with the most similar chemical composition to the Sun seen in meteorites, and significant amounts of water.
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