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By Ron Cowen of Nature magazine Physicists last week announced evidence that particles of dark matter--the invisible, hypothetical material believed to make up more than 80 percent of the mass of the Universe--may have a lower mass than suspected.

By Ron Cowen of Nature magazine Physicists last week announced evidence that particles of dark matter--the invisible, hypothetical material believed to make up more than 80 percent of the mass of the Universe--may have a lower mass than suspected. [More]

By Ron Cowen of Nature magazine Newly released observations of the top quark -- the heaviest of all known fundamental particles -- could topple the standard model of particle physics. [More]

By Ron Cowen of Nature magazine The Dawn spacecraft had a difficult birth: it was threatened by cost overruns and technical concerns, cancelled, reinstated and scaled down. [More]