Berkeley 59 is a young stellar clusters, which is experiencing a rapid asymmetric expansion Stars typically form in groups or stellar clusters containing from hundreds to thousands of members. Within these clusters, stars are not stationary but move along trajectories determined by the system’s overall gravity (that is, the gravitational potential of the cluster) and by their mutual interactions.
Stars do not form in isolation. During gravitational collapse, molecular clouds fragment, forming a large number of stars. For this reason, young stars are typically observed as members of star clusters or associations. In the past decade, the study of stellar clusters in the Milky Way has undergone a revolution, thanks to observations from the Gaia satellite of the
