You might be tempted to think that this is due to the motion of individual galaxies speeding around the universe, but the math doesn't add up. (livescience.com)
To further increase the number of collisions that can be studied, the team are also looking to study collisions involving individual galaxies, which are much more common. (sciencedaily.com)
Researchers believe it will eventually leave individual galaxies isolated in vast oceans of empty space. (scientificamerican.com)