See the answer here (http://physics.stackexchange.com/questions/161267/distribution-and-detection-of-dark-matter http://physics.stackexchange.com/questions/1612

See the answer here (http://physics.stackexchange.com/questions/161267/distribution-and-detection-of-dark-matter http://physics.stackexchange.com/questions/161267/distributi...). Currently we can only detect dark matter indirectly by measuring its gravitational effect. As far as I understand, at small scales (e.g. scale of solar system) it's density is very small.