News of the WeekAstrophysics

Orbiting Observatories Tally Dark Matter

Science  14 Sep 2001:
Vol. 293, Issue 5537, pp. 1970
DOI: 10.1126/science.293.5537.1970a

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WASHINGTON, D.C.-- As galaxy clusters belch x-rays in all directions, they reveal the hidden mass in the universe. At a meeting here celebrating 2 years of observations with the Chandra X-ray Observatory, astronomers claimed that Chandra observations, along with pictures from the Hubble Space Telescope, enabled them to calculate the amount of dark matter in the cosmos--and seriously damage one theory about its nature.