Noun
(cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force
Source: WordNetNobody knows what dark matter is. It is another deep mystery waiting to be explored. We know only that it is there, and that it weighs more than the stuff that we can see. Freeman Dyson
Dark matter has a gravitation effect on other objects. You can't see it, you can't feel it, but you can watch something being pulled in its direction. Jodi Picoult
She soon found the door the alethiometer had told her about. The sign on it said DARK MATTER RESEARCH UNIT, and under it someone had scribbled R. I. P. Another hand had added in pencil DIRECTOR: LAZARUS. Lyra made nothing of that. She knocked, and a woman's voice said, "Come in." Philip Pullman
Neutrinos are fundamental subatomic particles produced in nuclear reactions, like those in the sun. We always talk about the fact that we can't see neutrinos or dark matter and that basically they're invisible, but if you think about it from the other side, we're also invisible to them. Evalyn Gates
The existence of exotic dark matter particles outside the standard model of particle physics constitutes a central hypothesis of the current standard model of cosmology (SMoC). Using a wide range of observational data I outline why this hypothesis cannot be correct for the real Universe. Pavel Kroupa
Galaxies are observed to be simple systems following laws that result from scale-invariant dynamics which do not emanate from the haphazard merging history of halos of exotic dark matter. Pavel Kroupa