New Scientist said:
THE skeleton of dark matter that undergirds the cosmic web of matter in the universe has been clearly detected for first time.
We know that matter in the cosmos forms a web, with galaxies and clusters linked by filaments across mostly empty space. Filaments are made of normal matter and dark matter - the unseen stuff that makes up about 85 per cent of the universe's mass. Recent observations have seen the normal matter in such filaments.
Now Jörg Dietrich at the University Observatory in Munich, Germany, and his team have detected the dark matter component in a filament in a supercluster about 2.7 billion light years from us, called Abell 222/223.