Recent research proposes a new form of dark matter that may actually be lighter in mass than other dark matter candidates.

Dark matter is a ... so-called "missing mass" necessary for things like galaxies to clump together. Now Dr. Richard Lieu at ...

All matter has a gravitational field that attracts other objects. The more mass an object has, the greater its gravitational field will be. For example, the Earth has a greater gravitational field ...

Perhaps one of the most surprising discoveries of the 20th century was that this ordinary, or baryonic, matter makes up less than 5 percent of the mass of ... For example, pictures of galaxies ...