Has Hubble seen dark matter?
When the astronomers – Rodrigo Ibata from the European Southern Observatory, Harvey Richer and Douglas Scott from the University of British Columbia in Canada, and Ronald Gilliland from the Spac...
Controversy reigns over ‘dark matter’ claim
Alcock and co-workers have been searching for MACHOs – massive compact halo objects – with a technique known as gravitational lensing. In this the gravitational field of a heavy object act...
