Observations have revealed that most stars are born in clusters. These systems, containing from tens to thousands of stars and typically significant mass in gas in the youngest systems, evolve due to a combination of stellar and star-gas interactions. Simulations of pure stellar systems are used to investigate possible initial configurations including ellipticity, substructure and mass segregat...

I argue that the widely adopted framework of stellar dynamics survived since 1940s, is not fitting the current knowledge on non-linear systems. Borrowed from plasma physics when several fundamental features of perturbed non-linear systems were unknown, that framework ignores the difference in the role of perturbations in two different classes of systems, in plasma with Debye screening and gravi...

Stephan's Quintet (SQ) is a nearby compact galaxy group and perfect laboratory for studying the process of evolution through harassment interaction. By analysing kinematics SQ we aim to provide an increased understanding group, history interactions, their cause effect, details regarding physical processes occurring as galaxies interact. We have studied ionised gas stellar using Large Binocular ...