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Computer simulations based on the prevailing cosmological model, ΛCDM, reproduce many observed properties of our Universe. But a study of coherent satellite motions in galaxy clusters yields discrepancies that challenge the definition of ‘today’.
Analysis of archival XMM-Newton data yields measurements of stellar wind emission from three star systems, illustrating a direct method to determine the mass-loss rates of late-type main-sequence stars.
Kepler-1625b-I and Kepler-1708b-I are the most noteworthy exomoon candidates to date. A new analysis of the available data comes to a different conclusion.
Binary neutron star mergers are complex to understand astrophysically. A small piece of the puzzle may now have been solved using a computationally intensive simulation to explain how short gamma-ray bursts can be launched by a magnetar engine.
The size distribution of solid grains in dense clouds is a key parameter to constrain in order to understand grain growth, which influences the nature and timescale of the formation of protoplanets. A JWST study has quantified the grain size distribution by modelling the spectral absorptions arising from ice components of grains before protostellar collapse.
