4000 stars: there’s a river of stars flowing through the Sun’s neighborhood

And from the cluster sprang forth a river: that’s not an attempt to be lyrical, just cosmic reality. When stars are born in a star cluster, they often only spend their youth in this group. As time goes on, the entire star cluster starts to feel the effects of gravitational forces from nearby galaxies. Like all stars of the galaxy, the cluster is flung around its core, deforming it over time, with the cluster becoming longer and longer and finally forming a stellar stream – a group of stars tr...