We review the current knowledge about nuclear star clusters (NSCs), the spectacularly
dense and massive assemblies of stars found at the centers of most galaxies. Recent …

Stars are among the most fundamental structures of our Universe. They comprise most of the
baryonic and luminous mass of galaxies; synthesize heavy elements; and inject mass …

Context. Data from the Gaia satellite are revolutionising our understanding of the Milky Way.
With every new data release, there is a need to update the census of open clusters. Aims …

The astrophysical origin of gravitational wave (GW) events discovered by LIGO/VIRGO
remains an outstanding puzzle. In active galactic nuclei (AGNs), compact-object binaries …

The inner∼ 200 pc region of the Galaxy contains a 4 million M⊙ supermassive black hole
(SMBH), significant quantities of molecular gas, and star formation and cosmic-ray energy …

Neutral-atomic and molecular outflows are a common occurrence in galaxies, near and far.
They operate over the full extent of their galaxy hosts, from the innermost regions of galactic …

We present a unified description of the scenario of global hierarchical collapse (GHC). GHC
constitutes a flow regime of (non-homologous) collapses within collapses, in which all …

The Square Kilometre Array (SKA) is a planned large radio interferometer designed to
operate over a wide range of frequencies, and with an order of magnitude greater sensitivity …

We explore the evolution of stellar mass black hole binaries (BHBs) which are formed in the
self-gravitating discs of active galactic nuclei (AGN). Hardening due to three-body scattering …

Winds from massive stars have velocities of 1000 km s− 1 or more and produce hot, high-
pressure gas when they shock. We develop a theory for the evolution of bubbles driven by …