Gravitational Lensing Shows Presence of Dark Matter;
White Dwarfs May Account for 3-35% of Dark Matter
March 26, 2001  Gravitational lensing shows presence of dark matter, BBC; Population of cool white dwarfs may explain 3-35 % of dark matter, Science daily article.

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Galaxies BBC

BBC caption: One of the deep observations used in the gravitational lensing study