We may be more in the dark about dark matter than previously thought, according to a new analysis of distant galaxy clusters. Yale astrophysicist Priyamvada Natarajan, a leading theorist on the nature of black holes and dark matter, says new observational data conflicts with certain assumptions abou t cold dark matter (CDM)—unseen, slow-moving particles that are inferred by their effect on gravity—and may prompt a fundamental rethinking of dark matter by scientists. ...read more read less