| They discussed the understanding of dark matter by the use of gravitational lenses. |
| The CPA was established by the National Science Foundation expressly to study dark matter. |
| Most galaxies have more of the mysterious dark matter than ordinary, visible matter. |
| According to most theories of dark matter, it is too energetic to have been created by the annihilation of dark matter particles. |
| Galaxies are composed of billions to trillions of stars, as well as gas, dust, and dark matter, all bound together by gravity. |
| Identification of the different energetic particles, including dark matter, is done by pulse shape discrimination. |
