From “Serious Blow to Dark Matter Theories? New Study Finds Mysterious Lack of Dark Matter in Sun’s Neighborhood”(ScienceDaily, Apr. 18, 2012), we learn,
The most accurate study so far of the motions of stars in the Milky Way has found no evidence for dark matter in a large volume around the Sun. According to widely accepted theories, the solar neighbourhood was expected to be filled with dark matter, a mysterious invisible substance that can only be detected indirectly by the gravitational force it exerts. But a new study by a team of astronomers in Chile has found that these theories just do not fit the observational facts. This may mean that attempts to directly detect dark matter particles on Earth are unlikely to be successful. More.