This series of in-class educational resources is designed to help teachers explain a range of important topics in physics. Perimeter Explorations is the product of extensive collaboration between international researchers, Perimeter Institute’s outreach staff and experienced teachers. Each module has been designed with both the expert and novice teacher in mind and has been thoroughly tested in classrooms.
About your host
Dr. Damian Pope is the Senior Manager of Scientific Outreach at Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada. He holds a PhD in theoretical physics from the University of Queensland, Australia, and his area of speciality is quantum physics. He also has extensive experience in explaining the wonders of physics to people of all ages and from all walks of life.
Over the last few decades, physicists have come to realize that about 90% of the mass of every galaxy in the universe is made of an unseen substance called dark matter. Astronomers have studied light from distant stars, galaxies, planets, and other objects in space. However, over the last few decades, physicists have come to realize that celestial objects that emit any type of light make up only a tiny fraction of the universe. The rest of the universe is made of unseen material that does not emit, reflect, or absorb any type of electromagnetic radiation. This “dark matter” dominates galaxies, making up about 90% of the mass of every galaxy in the universe. Without it, galaxies (including our own) would be inherently unstable and would rapidly fall apart.
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