Dark Matter and the ILC
Almost a century ago, astronomers studying the motion of stars in our galaxy and in nearby clusters of galaxies discovered that most of the mass of galaxies is not visible as stars and gas. As we have learned more about the universe, this problem has becomes sharper. There is invisible matter out there, and we do not know what it is made of.
To discover the origin of this unknown matter, physicists propose many different approaches. One of the most powerful tools proposed is a particle accelerator, the International Linear Collider or ILC.