Space scientists have dubbed the merger of two galaxies a "cosmic guitar". A new Hubble Space Telescope image shows Arp 105, ...

The faint glow of individual stars stretching between two bright galaxies indicates that the galaxies are actively merging while the galaxy clusters that surround them merge as well. The image was ...

Astronomers have discovered a ghostly, million-light-year-long bridge of stars connecting two massive galaxies within the Abell 3667 cluster, 700 million light-years away. This glowing thread of ...