Star and planet formation are inextricably linked. In the earliest phases of the collapse of a
protostar, a disc forms around the young star and such discs are observed for the first …

Open clusters are unique tracers of the history of our own Galaxy's disc. According to our
membership analysis based on Gaia astrometry, out of the 226 potential clusters falling in …

Computational astrophysics is a new and quickly growing discipline. In this book the authors
outline the fundamentals for computational astrophysics, focusing on the use of the …

Abstract Models aiming to explain the formation of massive black hole seeds, and in
particular the direct collapse scenario, face substantial difficulties. These are rooted in rather …

Comets in the Oort cloud evolve under the influence of internal and external perturbations,
such as giant planets, stellar passages, and the Galactic gravitational tidal field. We aim to …

We have investigated the possibilities to quantify how much stars move in the Milky Way disc
due to diffuse processes (blurring) and due to influences from spiral arms and the bar …

The solar system was once rich in the short-lived radionuclide (SLR) 26 Al but poor in 60 Fe.
Several models have been proposed to explain these anomalous abundances in SLRs, but …

Jan Hendrik Oort hypothesized the existence of a distant cloud of cometary objects that orbit
the Sun based on a spike in the reciprocal orbital separation at 1∕ a≲ 10− 4 au− 1. The …

The tidal tails of stellar clusters provide an important tool for studying the birth conditions of
the clusters and their evolution, coupling, and interaction with the Galactic potential. The …

Using tracer particles embedded in self-gravitating shearing sheet N-body simulations, we
investigate the distance in guiding centre radius that stars or star clusters can migrate in a …