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RS Ophiuchi is the first nova to be detected in the very-high-energy range. Its gamma-ray emission provides evidence of proton acceleration following the thermonuclear outburst. These observations offer new insight into the origin of cosmic rays.
Samples returned from the carbonaceous (C-type) asteroid 162173 Ryugu by the Hayabusa2 mission were preliminarily analysed in a non-destructive manner. Their dark spectral features, small densities and absence of a high-temperature component imply that they are most similar to primitive CI group chondrites, but show some differences to known planetary materials.
Combining polarimetry with space-based photometry and archival spectroscopy has given us an unprecedented understanding of the characteristics and interior structure of the bright β Cephei-type variable star β Crucis.