<http://schema.org/alternativeHeadline>
"Officially known as ACT-CL J0102-4915, the cluster contains several hundred galaxies \u2014 which astronomers think was rare when the universe was young."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/huge-el-gordo-galaxy-cluster-packs-mass-of-3-quadrillion-suns>