<http://schema.org/alternativeHeadline>
"Researchers mapped the distribution of dark matter over a distance of 100 million light-years from the center of each galaxy and found that it is abundant and very well-organized."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/mysterious-dark-matter-isnt-elusive-its-everywhere>