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How to See the Invisible: 3 Approaches to Finding Dark Matter | DISCOVER Magazine
Spiral galaxy M74 holds 100 billion stars. Oddly, stars at its outer edges rotate with the same velocity as those closer in, suggesting the influence of a substantial mass of unseen dark matter. Credit: NASA Although we live in a renaissance era of cosmology, in which theories and observations have advanced to the stage where ideas can be precisely tested, we also live in the dark ages. About 23 percent of the universe consists of dark matter, mysterious stuff that exerts gravitational forces but doesn’t interact with light. Ordinary matter...
Published By: Discover Magazine - Wednesday, 22 February
