While we have plenty of spiral galaxies, like our own Milky Way, these are only the most common types of galaxies out there. There are still others, like elliptical or irregular galaxies.

Comparable is the effect of gargantuan galaxy clusters, the largest gravity-tethered objects in the universe, on mere galaxies ... and encompassing at least 20 massive galaxies!

These galaxies are thought to be the most common in the nearby Universe and might be the types of galaxies where life can develop given the nature of their formation history. However, astronomers ...