Have scientists seen dark matter? Maybe. Maybe not.
The Bullet Cluster, 3.8 bln light years from Earth, where NASA's Chandra X-ray Observatory is searching for the presence of antimatter.
( X-ray: NASA/CXC/CfA/M.Markevitch et al.; Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al. )
( X-ray: NASA/CXC/CfA/M.Markevitch et al.; Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al. )
