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    Grains of Dust from Asteroid Ryugu Older than our Solar System

    August 23, 2022, Categories  Astronomy/Space

    Grains of dust from Asteroid Ryugu older than our solar system
    (a) Backscattered electron (BSE) image of Ryugu thin section A0058-2. Every black area consists of ∼20 NanoSIMS maps measured. (b) An area in section C0002 with a less altered lithology than the surrounding Ryugu matrix (“clast 1”; BSE image). This area contains Mg-rich olivine, low-Ca pyroxenes, and spinel grains with sizes up to ∼15 μm (Kawasaki et al. 2022). Two of three O-anomalous grains identified in Ryugu, including one likely presolar silicate (g)–(h), were found in this region. (c)–(e) Secondary electron (SE) image of a Ryugu particle pressed into gold foil in which two presolar SiC grains were detected. The C-anomalous regions, indicated by the white arrows, are clearly associated with 28Si hotspots. (f) 17O-rich presolar oxide found in the Ryugu A0058-2 matrix...
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