Only 5 percent of the universe is believed to be made of normal matter, and that makes up every single galaxy, planet and star we see around us. (ibtimes.com)
The most popular theory suggests that dark matter consists of massive exotic particles that do not interact with normal matter except through gravity. (sciencemag.org)
Given its mass — it holds stars with about 200 million times the mass of the sun — it would be expected to have about 300 times as much dark matter as normal matter. (sciencenews.org)