A new simulation reveals how colliding dark matter particles could trigger cosmic collapses that shape galaxies—and possibly seed black holes. Credit: AI/ScienceDaily.com For nearly 100 years, dark matter has remained one of the biggest unanswered questions in cosmology. Although it cannot be seen directly, its gravitational influence shapes galaxies and the large-scale structure of the universe. At the Perimeter Institute, two physicists are investigating how a particular form of dark matter,