Interactions and Evolution
The figure shown below
(Ref)
is a Hubble Space Telescope image of a cluster of
galaxies approximately 8 billion light years away (one of the most distant galaxy clusters known)
in which there is evidence for a very large amount
of current and recent interaction between galaxies. Among the hundreds of galaxies in the image, 13 have
been identified as presently
undergoing or recently participating in collisions (see the blowups in the right panels
of the image).