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Saturn crossed the orbital resonance that tilted it to its present obliquity of 26.7° only about 1 billion years ago, affected by the fast migration of Titan. The impact of satellite migration on the evolution of giant planet obliquities may be a general phenomenon that could also be relevant for Jupiter and exoplanetary systems.
Gigaelectronvolt emission from a magnetar giant flare is discovered by the Fermi Gamma-ray Space Telescope, between 19 s and 284 s after the initial detection of a signal in the megaelectronvolt energy band, potentially generated by an ultra-relativistic outflow far from the stellar magnetosphere.
A high-resolution simulation of interstellar turbulence determines the position and width of the transition from supersonic to subsonic turbulence, providing quantitative input for models of filament structure and star formation in molecular clouds.
Hayabusa2 created an artificial crater on Ryugu to analyse the subsurficial material of the asteroid. Results show that the subsurface is more hydrated than the surface. It experienced alteration processes that can be traced back to Ryugu’s parent body.
