Galaxies exhibit a hierarchical organization, commencing with rare isolated systems and progressing to gravitationally bound groups (e.g., the Local Group), larger clusters, and extensive ...

We often think of galaxies either as individual “island universes” or as a member of a galaxy cluster. But there is another category of association: galaxy groups. Many galaxies — perhaps most in the ...

A cosmic dance could be the future of the Milky Way as it tracks a course to collide with neighboring galaxies, a University of Queensland survey has found. The paper is published in the Monthly ...